An investigation on possible effect of leaching fractions physiological responses of hot pepper plants to irrigation water salinity

BMC Plant Biology

Rangjian Qiu¹  Zaiqiang Yang¹  Chunwei Liu¹  Fusheng Li²  Zhenchang Wang³  Ningbo Cui⁴ 

[1] Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing University of Information Science and Technology;College of Agriculture, Guangxi University;College of Water Conservancy and Hydropower Engineering, Hohai University;State Key Laboratory of Hydraulics and Mountain River Engineering & College of Water Resource and Hydropower, Sichuan University;

关键词: Photosynthetic light–response curve;    CO2–response curve;    δ15N;    Δ13C;    Photosynthetic capacity;   

DOI  :  10.1186/s12870-019-1910-z

来源: DOAJ

【 摘 要 】

Abstract Background The modification effect of leaching fraction (LF) on the physiological responses of plants to irrigation water salinity (ECiw) remains unknown. Here, leaf gas exchange, photosynthetic light–response and CO2–response curves, and total carbon (C) and nitrogen (N) accumulation in hot pepper leaves were investigated under three ECiw levels (0.9, 4.7 and 7.0 dS m− 1) and two LFs treatments (0.17 and 0.29). Results Leaf stomatal conductance was more sensitive to ECiw than the net photosynthesis rate, leading to higher intrinsic water use efficiency (WUE) in higher ECiw, whereas the LF did not affect the intrinsic WUE. Carbon isotope discrimination was inhibited by ECiw, but was not affected by LF. ECiw reduced the carboxylation efficiency, photosynthetic capacity, photorespiration rate, apparent quantum yield of CO2 and irradiance–saturated rate of gross photosynthesis; however, LF did not influence any of these responses. Total C and N accumulation in plants leaves was markedly increased with either decreasing ECiw or increasing LF. Conclusions The present study shows that higher ECiw depressed leaf gas exchange, photosynthesis capacity and total C and N accumulation in leaves, but enhanced intrinsic WUE. Somewhat surprisingly, higher LF did not affect the intrinsic WUE but enhanced the total C and N accumulation in leaves.

【 授权许可】

Unknown