【目的】研究文冠果花芽分化过程外部形态变化与内部解剖结构的对应关系,并探究内源激素含量与花芽分化的关系,为文冠果花性别相关研究的适时采样与提高雌/雄花比例的调控技术提供参考。【方法】通过外部形态观测,结合石蜡切片技术,分析文冠果花芽分化内外部形态之间的对应关系。并采用高效液相色谱法(HPLC)对花芽分化过程中雌、雄能花的4种内源激素含量进行测定和比较,探究其与内源激素之间的关系。【结果】① 文冠果雌能花和雄能花在性别分化之前均为两性,雌能花的单核花粉粒在有丝分裂期呈液泡化衰败,雄能花大孢子母细胞四分体时期细胞停止分裂,性器官发育异常导致单性花的形成。此外,文冠果花芽分化内部结构与外部形态之间具有时序性对应关系。② 玉米素(zeatin,ZT)含量在花芽未分化期至雌蕊原基分化期逐渐上升,雌雄配子体形成时期,雌能花的ZT含量始终高于雄能花。雌能花雄蕊发育出现异常时的生长素(auxin,IAA)、胞落酸(abscisic acid,ABA)含量显著高于雄能花,赤霉素(gibberellin,GA)含量显著低于雄能花。说明高水平ZT促进花芽分化,利于雌能花的发育; 高水平的IAA和ABA具有促雌作用; 高水平的GA具有促雄效应。③ m(ABA)/m(IAA)、m(ABA)/m(GA)、m(ZT)/m(GA)在花芽未分化期至雌蕊原基分化期均处于较高水平,雄能花雌蕊发育异常时,其m(ABA)/m(IAA)和m(ZT)/m(IAA)显著高于雌能花。说明高水平的m(ABA)/m(IAA)、m(ABA)/m(GA)、m(ZT)/m(GA)有利于花芽分化; 高水平m(ABA)/m(IAA)、m(ZT)/m(IAA)对雄蕊发育有利。【结论】文冠果雌能花和雄能花各自对应另一性器官的败育导致了性别分化。花芽分化过程中,可以根据花芽外部形态判断内部分化时期。高水平的ZT含量、m(ABA)/m(IAA)、m(ABA)/m(GA)、m(ZT)/m(GA)利于花芽分化,高水平的m(ZT)、m(IAA)和m(ABA)利于雌能花发育,高水平的GA含量、m(ABA)/m(IAA)、m(ZT)/m(IAA)利于雄能花发育。
Abstract
【Objective】 The objective of this study is to study the relationship between external morphology and internal anatomical structure of flower buds during flower bud differentiation, and the relationship between hormones content and flower bud differentiation in Xanthoceras sorbifolium Bunge. The results will provide reference for the timely sampling in the study of X. sorbifolium Bunge flower sex and the regulation techniques used to increase the ratio of female to male flowers. 【Method】 Through the external morphology observation, combined with the paraffin sections, the correspondence between the internal and external morphology of the flower bud differentiation process was analyzed. To study the relationship between hormones content and flower bud differentiation in X. sorbifolium Bunge, four kinds of endogenous hormones in female flowers and male flowers were determined by HPLC. 【Result】 Both the female flowers and male flowers were bisexual before sex differentiation. There was vacuolization in mononuclear pollen grains during mitosis stage in female flowers, and the megaspore mother cell stopped dividing during the tetrad stage in male flowers. As a result, the abnormal development of sexual organs caused the formation of a unisexual flower. In addition, there was a temporal correspondence between the internal structure and the external morphology of flower buds. The zeatin(ZT)content increased gradually during the stage from flower bud undifferentiated period to pistil primordium differentiation. During male and female gametophyte formation period, the ZT content of female flowers was always higher than those of the male flowers. The IAA and ABA contents of female flowers were significantly higher than those of the male flowers when the stamens of female flowers developed abnormally, and the GA content was significantly lower than those of the male flowers. It is indicated that high levels of ZT can promote flower bud differentiation, and was beneficial to the development of female flowers. High levels of the IAA and ABA had a promoting effect on female flowers formation, and high levels of the GA promoted the development of male flowers. The ratios of m(ABA)to m(IAA), m(ABA)to m(GA), and m(ZT)to m(GA)were at a high level during the period from flower bud undifferentiated period to pistil primordium differentiation. When male flower pistil dysplasia was abnormal, the ratios of m(ABA)to m(IAA)and m(ZT)to m(IAA)of male flowers were significantly higher than that in females, indicating that high levels of the ratios of m(ABA)to m(IAA), m(ABA)to m(GA), and m(ZT)to m(GA)were beneficial to flower bud differentiation; and high levels ratio of m(ABA)to m(IAA)and m(ZT)to m(IAA)were beneficial to stamen development. 【Conclusion】 The abortion of the other sexual organ lead to the formation of female and male flowers in X.anthoceras sorbifolium. The internal differentiation period can be judged based on the external morphology during the flower bud differentiation. High levels of the ZT, m(ABA)/m(IAA), m(ABA)/m(GA), and m(ZT)/m(GA)are beneficial for flower bud differentiation. High levels of the ZT, IAA and ABA are beneficial for female flower development, and high levels of the GA, the ratios of m(ABA)to m(IAA)and m(ZT)to m(IAA)are beneficial for male flower development.
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 蔡龙. 提高中国特有能源树种文冠果座率的技术研究[D].北京: 北京林业大学, 2012. CAI L. The technological study for improving the fruit rate of Xanthoceras sorbifolia Bunge, a unique energy species[D]. Beijing: Beijing Forestry University, 2012.
[2] 敖妍. 不同地区文冠果群体种子含油率·产量变异规律[J].安徽农业科学, 2009, 37(25): 11967-11969. DOI:10.13989/j.cnki.0517-6611.2009.25.091. AO Y. Variation law of seed oil content and yield of Xanthoceras sorbifolium Bunge populations in different areas[J]. Journal of Anhui Agricultural Sciences, 2009, 37(25): 11967-11969.
[3] 马芳, 王俊, 王姮, 等. 文冠果树花部形态与开花物候的研究[J]. 北方园艺, 2014, 325(22): 80-84. MA F, WANG J, WANG H, et al. Study on floral characters and flowering phenology in Xanthoceras sorbifolia Bunge[J]. Northern Horticulture, 2014, 325(22): 80-84.
[4] 张敏, 王頔, 张雷, 等. 文冠果雌雄花发育过程形态结构比较[J]. 电子显微学报, 2012, 31(2): 154-162. DOI:10.3969/j.issn.1000-6281.2012.02.010. ZHANG M, WANG D, ZHANG L, et al. Female and male flower differentiation in Xanthoceras sorbifolium Bunge[J]. Journal of Chinese Electron Microscopy Society, 2012, 31(2): 154-162.
[5] YOUNG T E, GIESLER-Lee J, GALLIE D R. Senescence-incluced expression of cytokinin reverses pistil abortion during maize flower development[J]. Plant Journal, 2004, 38:910-922. DOI:10.1111/j.1365-313x.2004.02093.x.
[6] 王丽萍, 李志刚, 谭乐和, 等. 植物内源激素研究进展[J].安徽农业科学, 2011, 39(4): 1912-1914. DOI:10.13989/j.cnki.0517-6611.2011.04.150. WANG L P, LI Z G, TAN L H, et al. Research progress of plant endogeous hormone[J]. Journal of Anhui Agricultural Sciences, 2011, 39(4): 1912-1914.
[7] ADHIKARI S, BANDYOPADHYAY T K, GHOSH P. Hormonal control of sex expression of cucumber(Cucumis sativus L.)with the identification of sex linked molecular marker [J]. The Nucleus, 2012, 55: 115-122.DOI:10.1007/s13237-012-0061-5.
[8] 肖华山, 吕柳新, 陈志彤. 荔枝花芽分化过程中内源激素含量的动态变化[J]. 宁德师范学院学报(自然科学版), 2007, 19: 113-115.DOI:10.3969/j.issn.2095-2481.2007.02.001. XIAO H S, LV L X, CHEN Z T. Dynamic changes of endogenous hormone content during flower bud differentiation of litchi[J]. Journal of Ningde Teachers College(Natural Science), 2007, 19: 113-115.
[9] HEGELE M, MANOCHAI P, NAPHROM D et al. Flowering in longan(Dimocarpus longan L.)induced by hormonal changes following KClO3 applications[J]. European Journal of Horticultural Science, 2008, 73: 49.
[10] 金亚征, 姚太梅, 丁丽梅, 等. 果树花芽分化机理研究进展[J]. 北方园艺, 2013(7): 193-196. DOI:10.3969/j.issn.1003-5400.2014.09.264. JIN Y Z, YAO T M, DING L M, et al. Research progress on the mechanism of flower bud differentiation of fruit trees[J]. Northern Horticulture, 2013(7):193-196.
[11] MO C M, TU D P, HUANG J, et al. Morphological and endogenous hormones characteristics of flower bud of Siraitia grosvenorii during its differentiation[J]. Acta Botanica Boreali Occidentalia Sinica, 2015, 35(1): 98-106. DOI:10.7606/j.issn.1000-4025.2015.01.0098.
[12] GAO Y, LIU H, PEI D. Morphological characteristics and in situ auxin production during the histogenesis of staminate flowers in precocious walnut[J]. Journal of the American Society for Horticulturalence,2014, 139: 185-190.
[12] 郭成圆. 板栗花芽分化及内源激素变化的研究[D]. 杨凌:西北农林科技大学, 2010. GUO C Y. Study on the flower bud differentiation and the change of endogenous hormone in chestnut[D]. Yangling: Northwest A & F University, 2010.
[14] KONG L, ADERKAS Von P, ZAHARIA L I. Effects of exogenously applied gibberellins and thidiazuron on phytohormone profiles of long-shoot buds and cone gender determination in Lodgepole pine[J]. Journal of Plant Growth Regulation, 2016, 35(1):172-182.DOI:10.1007/s00344-015-9517-6.
[15] 敖妍, 段劼, 于海燕, 等. 文冠果研究进展[J]. 中国农业大学学报, 2012, 17(6): 197-203. AO Y, DUAN J, YU H Y, et al. Research progress on Xanthoceras sorbifolia Bunge[J]. Journal of China Agricultural University, 2012, 17(6): 197-203.
[16] 吴尚, 马履一, 段劼, 等. 文冠果花期和果期内源激素的动态变化规律[J]. 西北农林科技大学学报(自然科学版), 2017,45(4):111-118. DOI:10.13207/j.cnki.jnwafu.2017.04.016 WU S, MA L Y, DUAN J, et al. Changes of endogenous hormones in Xanthoceras sorbifolia Bunge at florescence and fruit periods[J]. Journal of Northwest A & F University(Natural Science Edition), 2017, 45(4): 111-118.
[17] 漆小雪, 韦霄, 王熊军, 等. 金花茶花期内源激素含量的变化[J]. 江苏农业科学, 2013, 41(3): 141-144. DOI:10.3969/j.issn.1002-1302.2013.03.057. QI X X, WEI X, WANG X J, et al. Changes of source hormone content during Camellia sinensis[J]. Jiangsu Agricultural Sciences, 2013, 41(3): 141-144.
[18] 魏永赞, 董晨, 王弋, 等. 荔枝花芽分化与花性别分化研究进展[J]. 广东农业科学, 2017, 44(7): 34-40. WEI Y Z, DONG C, WANG Y, et al. Advances in flower bud differentiation and flower sex determination in litchi[J]. Guangdong Agricultural Sciences, 2017, 44(7): 34-40.
[19] 王宏国. 龙眼花性分化的细胞学机制研究[D]. 福州: 福建农林大学, 2008. WANG H G. Study on the cytology mechanism of flower sexual differentiation in longan [D]. Fuzhou: Fujian Agriculture And Forestry University, 2008.
[20] 王平, 郑伟, 陈伟. 荔枝花性别分化过程的荧光显微观察[J]. 热带作物学报, 2010, 31(5): 740-744. DOI:10.3969/j.issn.1000-2561.2010.05.010 WANG P, ZHENG W, CHEN W. Fluorescence microscopy of the sex differentiation process of litchi flower[J]. Chinese Journal of Tropical Crops, 2010, 31(5):740-744.
[21] 韩明慧, 彭方仁, 邓秋菊, 等. 薄壳山核桃雌雄花芽分化外部形态与内部结构的关系[J]. 南京林业大学学报(自然科学版), 2017, 41(6): 1-7. DOI:10.3969/j.issn.1000-2006.201703020. HAN M H, PENG F R, DENG Q J, et al. Observation of morphological and anatomical characters on staminate and pistillate flower differentiation in Carya illinoensis(Wangenh.)C. Koch[J]. Journal of Nanjing Forestry University(Natural Sciences Edition), 2017, 41(6): 1-7.
[22] 王丽媛, 郭素娟. 板栗‘燕山早丰’雌花分化的解剖学研究[J]. 中南林业科技大学学报, 2017, 37(1): 43-47. DOI:10.14067/j.cnki.1673-923x.2017.01.008. WANG L Y, GUO S J. Study on anatomy of development of female flower in chestnut ‘Yanshanzaofeng’[J]. Journal of Central South University of Forestry & Technology, 2017, 37(1): 43-47.
[23] 许自龙, 汪阳东, 陈益存, 等. 山鸡椒雄花花芽发育形态解剖特征观察[J]. 植物科学学报, 2017, 35(2): 152-163. DOI:10.11913/PSJ.2095-0837.2017.20152. XU Z L, WANG Y D, CHEN Y C, et al. Observation of the morphological and anatomical characteristics of male flower bud development in Litsea cubeba(Lour.)pess[J]. Plant Science Journal, 2017, 35(2): 152-163.
[24] 胡盼, 王川, 王军辉, 等. 青海云杉花芽分化期内源激素含量的变化特征[J]. 西北植物学报, 2012, 32(3): 540-545. DOI:10.3969/j.issn.1000-4025.2012.03.016. HU P, WANG C, WANG J H, et al. Content changes of endogenous hormones during flower bud differentiation of Picea crassifolia[J]. Acta Botanica Boreali-Occidentalia Sinica, 2012, 32(3): 540-545.
[25] 杨同文, 李潮海. 玉米性别决定的激素调控[J]. 植物学报, 2012, 47: 65-73. DOI:10.3724/SP.J.1259.2012.00065. YANG T W, LI C H. Hormone regulation of maize sex determination[J]. Bulletin of Botany, 2012,47: 65-73.
[26] 焦竹青, 王振兴, 许培磊, 等. 山葡萄雄株花蕾性别转换的形态观察及其内源激素的变化[J]. 北方园艺, 2012(16): 5-8. JIAO Z Q, WANG Z X, XU P L, et al. Morphological observation of the sex conversion of male flower buds and changes of endogenous hormones in Mountain grape[J]. Northern Horticulture, 2012, 16: 5-8.
[27] 肖华山, 吕柳新, 陈志彤. 荔枝花发育过程中雌雄蕊内源激素的动态变化[J]. 应用与环境生物学报, 2003(1): 11-15. DOI:10.3321/j.issn:1006-687X.2003.01.003. XIAO H S, LV L X, CHEN Z T. Dynamic changes of endogenous hormone in litchi(Litchi chinensis Sonn.)pistil and stamen during flower development[J]. Chinese Journal of Applied and Environmental Biology, 2003(1): 11-15.
[28] BANKS J A. MicroRNA, sex determination and floral meristem determinacy in maize[J]. Genome Biol, 2008, 9: 204. DOI:10.1186/gb-2008-9-1-204.
[29] CAO S Y, ZHANG J C, WEI L H. Studies on the changes of endogenous hormones in the differentiation period of flower bud in apple trees [J]. Journal of Fruit Science, 2000, 17(4): 244-248. DOI:10.13925/j.cnki.gsxb.2000.04.002.
[30] CAO S Y, TANG Y Z. Effects of GA3 and PP333 on the apple flower bud differentiation course and contents of endogenous hormone [J]. Journal of Fruit Science, 2001, 18(6): 313-316. DOI:10.13925/j.cnki.gsxb.2001.06.001.
[31] SHI J K, ZHANG W P, FAN W G, et al. Changes in endogenous hormones during the differentiation of female flower bud of ginkgo(G. biloba L.)[J]. Acta Horticulturae Sinica, 1999, 26(3): 194-195.
[32] 孔冬梅. 激素对高等植物性别分化的调控研究进展[J].安徽农业科学, 2009, 37(12): 5352-5354. DOI:10.3969/j.issn.0517-6611.2009.12.013. KONG D M. Advances in studies on the regulation of hormones on sex differentiation in higher plants[J]. Journal of Anhui Agricultural Sciences, 2009, 37(12): 5352-5354.
[33] KUMAR A, JAISWAL V S. Sex reversal and fruit formation on male plants of Carica papaya L. by ethrel and chlorflurenol [J]. Proceedings: Plant Sciences, 1984, 93(6): 635-641.
[34] CHAILAKHYAN M K. Genetic and hormonal regulation of growth, flowering, and sex expression in plants [J]. American Journal of Botany, 1979, 66(6):717-736.
[35] 惠文凯, 杨舒贻, 陈涵斌, 等. 赤霉素诱导麻疯树雌雄花分化的研究[J]. 南京林业大学学报(自然科学版), 2016,40(6): 175-179. DOI:10.3969/j.issn.1000-2006.2016.06.027. HUI W K, YANG S Y, CHEN H B, et al. Study on the differentiation of male and female flowers induced by gibberellin[J]. Journal of Nanjing Forestry University(Natural Sciences Edition), 2016, 40(6): 175-179.
[36] LI T H, HUANG W D, MENG Z Q. Study on the mechanisms of flower bud induction in apple tree[J]. Acta Physiologica Sinica, 1996, 22(3): 251-257.
[37] WANG Y H,FAN C H, SHEN X, et al. Changes in endogenous hormones during the flower bud differentiation of sweet cherry[J]. Acta Agriculturae Boreali Occidentalis Sinica, 2002, 11(1): 64-67. DOI:10.7606/j.issn.1004-1389.2002.1.020.
[38] 曾骧. 果树生理学[M]. 北京: 北京农业大学出版社, 1992. ZENG X. Fruit tree physiology[M]. Beijing: Beijing Agricultural University Press, 1992.
[39] DUAN N, JIA Y K, XU J, et al. Research progress on plant endogenous hormones [J]. Chinese Agricultural Science Bulletin, 2015, 31(2): 159-165.
[40] ADHIKARI S, BANDYOPADHYAY T K, GHOSH P. Hormonal control of sex expression of cucumber(Cucumis sativus L.)with the identification of sex linked molecular marker[J]. The Nucleus, 2012, 55: 115-122.
基金
收稿日期:2018-10-10 修回日期:2019-01-18 基金项目:中央高校基本科研业务费专项资金项目(2015ZCQ-LX-02); 国家自然科学基金青年科学基金项目(31600241)。 第一作者:张宁(zhangning2269@126.com)。*通信作者:敖妍(aoyan316@163.com),副教授,ORCID(0000-0002-8921-9767)。