草业学报2019，Vol.28Issue(1)：50-59,10.DOI:10.11686/cyxb2018307
敖汉和维多利亚紫花苜蓿对低磷环境应激机制的比较
Comparison of response mechanisms to low inorganic phosphate stress between alfalfa varieties Aohan and Victoria
摘要
Abstract
In order to compare the performance and adaptive mechanisms of two varieties of alfalfa under low inorganic phosphate (low-Pi) conditions, and to provide more information for improvement of Pi utilization efficiency and absorption efficiency in alfalfa, the varieties Aohan and Victoria were grown under low-Pi (5μmol·L-1 KH2PO4) and normal Pi (500μmol·L-1 KH2PO4) conditions.Morphological and physiological traits were measured at 10, 15 and 20 days.It was found that, the height, aboveground biomass and Pi content of both Aohan and Victoria were decreased under low-Pi stress;while the underground biomass, root-shoot ratio, total root length, root surface area and Pi utilization were increased.The net photosynthetic rate, stomatal conductance and transpiration rate were decreased significantly under low-Pi (P＜0.05), but the decrease was much smaller in cultivar Aohan than in cultivar Victoria.The acid phosphatase activity of both was significantly enhanced (P＜0.01), and for Aohan was significantly higher than that of Victoria (P＜0.01).To sum up, low-Pi stress inhibited the growth of the above ground plant organs and promoted growth of the underground parts.The greater low-Pi tolerance of Aohan compared to Victoria is associated with greater increase in acid phosphatase activity under low-Pi in Aohan, and a lower reduction in photosynthesis under low-Pi.The contrasting responses of the two varieties under low-Pi stress indicate a potential mechanism for alfalfa tolerance to low-Pi.关键词
紫花苜蓿/低磷胁迫/磷含量/净光合速率/酸性磷酸酶活性Key words
Medicago sativa/low-Pi tolerance/Pi content/net photosynthetic rate/acid phosphatase activity引用本文复制引用
李振松,栗振义,张绮芯,何峰,王宇菲,万里强,李向林,仝宗永..敖汉和维多利亚紫花苜蓿对低磷环境应激机制的比较[J].草业学报,2019,28(1):50-59,10.基金项目
中央级公益性科研院所基本科研业务费(2016ywf-yb-9)和现代农业产业技术体系建设专项资金(CARS-34)资助 （2016ywf-yb-9）
