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为研究木薯品种之间对干旱忍耐能力差异及失水情况差异,本研究通过土培盆栽实验,对2个国内主栽品种KU50和SC124进行了停止浇水式的干旱处理,分析两个木薯品种在干旱胁迫过程中的失水动态,并比较了处理前后两个品种失水总量和相对生长量。结果发现:(1)两个木薯品种面对干旱胁迫采取的耐旱方式不一样,未经驯化的干旱处理下,SC124采取的是“前慢后快”的失水方式,KU50采用的是“前快后慢”的失水方式;(2)预干旱驯化处理能显著影响木薯干旱胁迫时的失水方式,且各品种响应存在差异,SC124失水的绝对量和相对量均显著低于KU50,说明驯化处理对SC124耐旱能力的提升幅度更大,既减少了失水量,又维持了较为稳定的生长量,更大程度地提高了水分利用率。木薯干旱时失水的动态分析帮助我们理解植物应对干旱时的失水动态过程,进而有助于后续木薯耐旱相关生理特性的深入解析及抗旱相关基因的挖掘。
In order to study the differences of tolerance ability and water loss between two cassava varieties, the two domestic cultivars KU50 and SC124 were subjected to water-stop drought treatment and two cassava varieties The water loss dynamics during drought stress and the total amount of water loss and relative growth of two cultivars before and after treatment were compared. The results showed that: (1) The drought tolerance of two cassava varieties under different drought stress was different. Under the condition of untreated drought, SC124 adopted the method of water loss after “slow and fast before”, KU50 adopted (2) Pre-drought acclimation treatment can significantly affect the water loss pattern of cassava during drought stress, and there is a difference in the response of different varieties. The absolute and relative amounts of SC124 water loss Significantly lower than the KU50, indicating that domestication treatment of SC124 increased drought tolerance capacity, both to reduce the amount of water loss, but also to maintain a more stable growth, to a greater extent to improve water use efficiency. The dynamic analysis of water loss during drought in cassava helps us to understand the dynamic process of plant water loss during drought and further contribute to the further analysis of physiological characteristics related to drought tolerance and the excavation of drought-related genes.