摘要
油茶适宜生长在酸性土壤中,但酸性土壤容易产生铝胁迫作用。为了寻找磷缓解油茶铝胁迫作用的最适宜浓度,以高州油茶幼苗为试验对象,设铝浓度为1.01 cmol·kg^(-1),并设磷含量分别为0.00(处理Ⅰ)、0.16(处理Ⅱ)、0.33(处理Ⅲ)、0.50(处理Ⅳ)、1.00(处理Ⅴ)cmol·kg^(-1),采用土培法对油茶幼苗进行了铝胁迫和磷抗铝胁迫的试验研究。结果表明:磷含量分别为0.50和1.00 cmol·kg^(-1)的处理Ⅳ与Ⅴ均能有效缓解铝胁迫对高州油茶净光合作用的抑制,均能使其胞间CO2浓度恢复到CK水平(P>0.05);较低含量的磷处理能显著提高高州油茶的水分利用效率;当磷含量≥0.50 coml·kg^(-1)时,磷处理不能完全降低受铝胁迫的高州油茶的初始荧光值;含量为1.00 cmol·kg^(-1)的磷处理能完全有效地缓解铝胁迫对高州油茶实际光合效率、电子传递效率和最大光合效率的抑制作用。
Camellia oleiferais is fit to grow in acid soil, which always exists A1 stress. In order to find the optimum P concentration to alleviate AI stress, using C. gauchowensis seedlings as research objects, A1 stress and P alleviating A1 stress experiments of C. gauchowensis seedlings were put forward by using soil culture method, AI concentration was 1.01 cmol·kg-1, and P contents were set four treatments of 0.00 cmol·kg-1 ( Ⅰ ), 0.16 cmol·kg-1 (Ⅱ ), 0.33 cmol·kg-1 (Ⅲ ), 0.50 cmol·kg-1(Ⅳ ), and 1.00 cmol·kg-1 ( Ⅴ ). The results showed that 0.50 cmol·kg-1 ( Ⅳ ) and 1.0 cmol·kg-1 ( Ⅴ ) of P could effectively alleviate inhibition of A1 stress to net photosynthesis of C. gauchowensis and could recover intercellular CO2 concentration to CK level. Lower P content could significantly enhance water use efficiency in C. gauchowensis. When P content was ≥ 0.50 cmol·kg-1, it could not effectively decreaseinitial fluorescence in C. gauchowensis under A1 stress. 1.0 cmol·kg-1 1 p could effectively alleviate inhibition of Al stress to actual photosynthesis efficiency, electron transport efficiency and maximal photosynthesisrate in C. gauchowensis. Keywords: Camellia gauchowensis Chang.; P element; AI stress; photosynthesis; inhibition
出处
《经济林研究》
北大核心
2017年第3期115-120,139,共7页
Non-wood Forest Research
基金
广东省科技计划项目"油茶安全高效种植关键技术集成与应用示范"(2015A020208013)
国家林业公益性行业科研专项经费项目(201504703)
关键词
高州油茶
磷元素
铝胁迫
光合作用
抑制
Camellia gauchowensis Chang.
P element
AI stress
photosynthesis
inhibition
作者简介
陈思宁,硕士研究生。
通讯作者:黄永芳,教授,硕士。E-mail:hyfang@scau.edu.cn