不同pH处理对澳洲坚果幼苗生长及生理特性的影响

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中图分类号：S664.9文献标志码：A

Effects of Different pH Treatments on Growth and Physiological Characteristics of Macadamia integrifolia

HUAN XiuJu， QIN XiaoMin， PAN HaoNan， YANG XiaoZhou， PAN ZhenZhen， WEI ZheJun， HE XianYang， WANG WenLin， ZHENG ShuFang， TAN QiuJin* （Guangxi South Subtropical Agricultural Scientific Research Institute， Chongzuo， Guangxi 532415， China）

Abstract： 【Objective】 This study aimed to investigate the tolerance of macadamia （Macadamia integrifolia） seedlings to acid stress.【Method】 This study used the seedlings of M. integrifolia variety H2 as test materials and conducted a pot sand culture experiment treated with different pH levels （3，4，5，6），and the treatment with pH 6 was used as the control （CK）.The growth and physiological characteristics of macadamia seedlings were analyzed at after treatment.【Result】 The research results showed that， after 90 d of acid stress treatment， the growth of macadamia plants was significantly inhibited， and plant height （PLH），leaf area （LA）， shoot dry weight （SDW） and root dry weight （RDW） of macadamia seedlings showed an extremely significantly decrease （P<0.01） .The acid stress significantly inhibited ground diameter （GD） （P<0.05） . Compared with that of CK， the GD under pH 5， pH 4， and pH 3 conditions decreased by 5.7% ， 7.3% ，and 13.5% ，respectively. The acid stress did not significantly influence root-shoot ratio （RSR）. The chlorophyll content determination showed that acid stress extremely significantly reduced the chlorophyll a content （CAC） and total chlorophyll content， but had no significant effect on chlorophyll b content. The physiological characteristics analysis of root showed that， under acidic conditions， the content of soluble protein and malondialdehyde （MDA） showed an extremely significant decrease，while the content of abscisic acid （ABA） extremely significantly increased. Compared with CK， the ABA content in the treatments with pH 3， pH 4 and pH 5 extremely significantly increased by 19.3% 。（剩余22026字）