南京林业大学学报(自然科学版) ›› 2020, Vol. 44 ›› Issue (2): 84-90.doi: 10.3969/j.issn.1000-2006.201811043

• 研究论文 • 上一篇    下一篇

砧木对薄壳山核桃嫁接苗光合及荧光特性的影响

李晓锐1(), 周樊1, 冯刚1, 郑小琴1, 李永荣2, 彭方仁1,*()   

  1. 1.南京林业大学,南方现代林业协同创新中心,南京林业大学林学院,江苏 南京 210037
    2.南京绿宙薄壳山核桃科技有限公司,江苏 南京 210007
  • 收稿日期:2018-11-26 修回日期:2019-09-12 出版日期:2020-03-30 发布日期:2020-04-01
  • 通讯作者: 彭方仁
  • 基金资助:
    江苏省林业科技创新与推广项目(LYKJ [2018] 05-1);江苏高校优势学科建设工程资助项目(PAPD)

Photosynthetic and fluorescence characteristics of pecan grafting seedlings grafted on different rootstocks

LI Xiaorui1(), ZHOU Fan1, FENG Gang1, ZHENG Xiaoqin1, LI Yongrong2, PENG Fangren1,*()   

  1. 1. Co-Innovation Center for the Sustainable Forestry in Southern China,College of Forestry,Nanjing Forestry University, Nanjing 210007,China
    2. Nanjing Green Universe Pecan Science & Technology Co., Ltd., Nanjing 210037, China
  • Received:2018-11-26 Revised:2019-09-12 Online:2020-03-30 Published:2020-04-01
  • Contact: PENG Fangren

摘要:

【目的】探索不同砧木类型薄壳山核桃嫁接苗光合及荧光特性差异,为选育优良砧木、改进栽培管理方式提供科学依据。【方法】以薄壳山核桃‘Elliott’、‘Sauber’和‘Podsednik’实生苗作砧木,嫁接品种‘Pawnee’为接穗,研究3种不同砧木1年生‘Pawnee’嫁接苗的光合特性和叶绿素荧光诱导动力学特性。【结果】‘Elliott’嫁接苗(砧木‘Elliott’,接穗‘Pawnee’)在高光强下的净光合速率(Pn)以及对光照的利用范围高于‘Sauber’嫁接苗(砧木‘Sauber’,接穗‘Pawnee’)和‘Podsednik’嫁接苗(砧木‘Podsednik’,接穗‘Pawnee’);‘Podsednik’嫁接苗的暗呼吸速率(Rd)和光补偿点(LCP)最大,在弱光下消耗有机物最多;‘Sauber’的表观量子效率(AQY)最大,利用弱光能力最强;水分利用效率(RWUE)与净光合速率(Pn)极显著正相关,‘Elliott’嫁接苗的RWUE最大,生产有机物效率更高。荧光分析表明,‘Sauber’嫁接苗的热耗散最大,用于电子传递的量子产额(φEo)以及反应中心捕获的激子将电子传递到初级醌受体(QA)之后受体的概率(ψo)最小,‘Podsednik’嫁接苗的质体醌大小(Sm)、QA被还原次数(N)和质体醌还原速率[Sm/t(Fm)]最高,电子传递效率最高;‘Elliott’嫁接苗的3项荧光性能指数均为最高,‘Sauber’嫁接苗的最小。【结论】‘Elliott’嫁接苗具有更好的光合能力及水分利用效率,对环境的适应性更好,‘Podsednik’嫁接苗的光反应能力更强,‘Sauber’嫁接苗光合能力较弱。

关键词: 薄壳山核桃, 嫁接苗, 砧木, 光合作用, 叶绿素荧光特性

Abstract:

【Objective】 This study aimed to explore the differences in photosynthetic and fluorescence characteristics of pecan (Carya illinoensis) grafting plants grafted on different rootstocks, providing a scientific basis for breeding excellent rootstocks and improving cultivation management methods. 【Method】Pecan cultivars ‘Elliott’, ‘Sauber’ and ‘Podsednik’ were used as rootstocks and grafted using a ‘Pawnee’ scion. Next, the photosynthetic characteristics and chlorophyll fluorescence induction kinetics parameters of grafting seedlings were studied. 【Result】The net photosynthetic rate ( Pn) and use of light of ‘Elliott’ (rootstock: ‘Elliott’; scion: ‘Pawnee’) were higher than those of ‘Sauber’ (rootstock: ‘Sauber’; scion: ‘Pawnee’) and ‘Podsednik’ (rootstock: ‘Podsednik’; scion: ‘Pawnee’). ‘Podsednik’ showed the highest dark respiration rate ( Rd) and light compensation point (LCP), which suggests higher consumption of organic matter under low light. ‘Sauber’ exhibited a greater ability to use low light owing to its higher apparent quantum efficiency ( AQY). Water use efficiency (RWUE) and Pn were significantly positively correlated. ‘Elliott’ showed the highest RWUE, which is conducive to organic matter production. Fluorescence analysis indicated that ‘Sauber’ had the highest heat dissipation rate and the lowest lectron transport capacity, whereas ‘Podsednik’ had the biggest normalized total complementary area above the O-I-J-P phase ( Sm), the maximum number of primary quinone acceptor (QA) reduction events between time 0 and t(Fm) (N) and the highest reduction rate of plastoquinone [Sm/t(Fm)], leading to more efficient electron transfer. The highest and lowest performance index values were found in ‘Elliott’ and ‘Sauber’, respectively. 【Conclusion】‘Elliott’ grafting seedling exhibited the highest photosynthetic capacity and water use efficiency, whereas ‘Sauber’ grafting seedling had the weakest performance in photosynthesis. ‘Elliott’ grafting seedling showed a greater adaptability to the environment, and ‘Podsednik’ grafting seedling had a higher photoreactive capacity.

Key words: Carya illinoensis, grafting seedling, rootstock, photosynthesis, chlorophyll fluorescence characteristics

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