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砧木对薄壳山核桃嫁接苗光合及荧光特性的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2020年02期
Page:
84-90
Column:
研究论文
publishdate:
2020-03-31

Article Info:/Info

Title:
Photosynthetic and fluorescence characteristics of pecan grafting seedlings grafted on different rootstocks
Article ID:
1000-2006(2020)02-0084-07
Author(s):
LI Xiaorui1ZHOU Fan1FENG Gang1ZHENG Xiaoqin1LI Yongrong2PENG Fangren1*
(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)
Keywords:
Carya illinoensis grafting seedling rootstock photosynthesis chlorophyll fluorescence characteristics
Classification number :
S718
DOI:
10.3969/j.issn.1000-2006.201811043
Document Code:
A
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

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Last Update: 2019-03-25