Dynamic changes of nutrients during flora development in heterodichogamous Cyclocarya paliurus

doi:10.3969/j.issn.1000-2006.201802018

HUANG Peng, MAO Xia, HAN Ge, CHEN Xiaolin, FU Xiangxiang

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2018, Vol. 42 ›› Issue (05) : 1-9.

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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2018, Vol. 42 ›› Issue (05) : 1-9. DOI: 10.3969/j.issn.1000-2006.201802018

Dynamic changes of nutrients during flora development in heterodichogamous Cyclocarya paliurus

HUANG Peng, MAO Xia, HAN Ge, CHEN Xiaolin, FU Xiangxiang^*

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Abstract

【Objective】Cyclocarya paliurus is a typical heterodichogamous species. To demonstrate nutrient the regulatory mechanism of heterodichogamous characteristics of flowering in C. paliurus, dynamic changing patterns of nutrients in the flowers and surrounding tissues during various developmental stages of the floral were monitored. 【Method】 In two mating types(protandry, PA and protogyny, PG)of C. paliurus selected from a plantation, changes in morphology and length of male and female inflorescences(male, ♂; female, ♀)were observed and measured; also, dynamic changes in starch, soluble sugar, and soluble protein content in the flowers and surrounding tissues(branch surrounding male bud,♂Z; branch and leaves surrounding female bud,♀Z and♀Y)during the process of floral development were measured. 【Result】 ① Starch: much starch was found in the flower buds and branches before initiation, and the contents declined with the process of inflorescence development. The content of starch in♂Z was significantly higher than in♀Z, and the content in♂Z of PA was higher than that of PG. ②Soluble sugar: large amounts of soluble sugar were found in♂Z before bud initiation and changing patterns of soluble sugar showed a dynamic pattern of “declining to increasing, then a tendency to stabilize.” The content in the♂fluctuated with a little change, whereas the tendency of “rising to declining” and the maximum in the end of elongation growth of the ♀ occurred in the flower and surrounding tissues. ③ Soluble protein: more soluble protein was accumulated in the♂of PA than PG before bud initiation, and the content decreased gradually with floral development; whereas the content in♂Z changed a little. Soluble protein in the♀reached a peak before elongation growth of the inflorescence; whereas changing patterns of the content in♀Y of PA were observed. However, changing patterns of the soluble protein content in♀Z were different between PA and PG. 【Conclusion】Soluble sugar for floral development was from soluble sugar and hydrolysis products of starch stored in flowers and surrounding the branch, whereas soluble sugar stored in♂Z of PA was much higher than that of PG. Soluble protein stored in the♂or photosynthetic products input provided the needs for male flower development, whereas photosynthetic products were the only source for female flower development. Although changing patterns of starch and soluble nutrients are different in stages and sequences of male and female flowers between PA and PG, they were synchronized precisely with the process of floral development.

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HUANG Peng, MAO Xia, HAN Ge, CHEN Xiaolin, FU Xiangxiang. Dynamic changes of nutrients during flora development in heterodichogamous Cyclocarya paliurus[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2018, 42(05): 1-9 https://doi.org/10.3969/j.issn.1000-2006.201802018

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