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首页> 外文期刊>Canadian Journal of Plant Science >Osmotic adjustment in leaves of Brassica oilseeds in response to water deficit
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Osmotic adjustment in leaves of Brassica oilseeds in response to water deficit

机译：水分胁迫对甘蓝型油菜叶片渗透调节的影响

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摘要

The influence of water deficit on water content (WC), total soluble solids (TSS), osmotic potential (OP), sugar content and osmotic adjustment (OA) of expanded and partly expanded leaves of Brassica oilseeds was examined. Nine canola (B. napus) cultivars (Karoo, Monty, Pinnacle, Hyden, Mystic, Rainbow, Surpass 300, Surpass 400, Surpass 501), two doubled haploids, one from Karoo (KDH) and the other from Monty (MDH) and one line of Indian mustard (B. juncea, PI-81792) were grown under glasshouse and net-house conditions. Expanded wilted leaves of Karoo and Monty absorbed excessive amounts of water per dry weight upon in vitro rehydration compared with control non-stressed leaves, resulting in underestimation of OA calculated on the basis of the relative water content (RWC). Hence, estimation of OA based on water weight per leaf dry weight (WC) was preferred. Young expanding leaves maintained visual turgor for 6-7 d after withholding irrigation, while expanded leaves on the same plants ceased to regain turgor overnight. The young expanding leaves exhibited greater accumulation of TSS and, consequently, more negative OPs compared with expanded leaves. Maintenance of OA after irrigation and turgor recovery was evident in both expanded and expanding leaves. Although OA under drought and upon turgor recovery varied within cultivars in different experiments, outstanding OA capacity, in terms of both magnitude and stability, was identified in the cultivar Hyden and in the doubled haploid of Monty, indicating the potential to select for this trait as well as to exploit variability for OA through haploidization.
机译：研究了水分亏缺对甘蓝型油菜种子叶片的含水量（WC），总可溶性固形物（TSS），渗透势（OP），糖含量和渗透调节（OA）的影响。九个油菜（B. napus）品种（Karoo，Monty，Pinnacle，Hyden，Mystic，Rainbow，Surpass 300，Surpass 400，Surpass 501），两个加倍单倍体，一个来自Karoo（KDH），另一个来自Monty（MDH），以及在温室和温室条件下种植了一种印度芥菜（B. juncea，PI-81792）。与对照非胁迫叶片相比，体外复水后，膨胀的Karoo和Monty枯萎叶片每干重吸收过量的水，导致根据相对含水量（RWC）计算出的OA被低估了。因此，优选基于每叶片干重（WC）的水重量来估计OA。停止灌溉后，年轻的扩张叶片保持视觉膨润度达6-7 d，而相同植物上的扩张叶片则不再恢复膨润力过夜。与膨胀叶片相比，年轻的膨胀叶片表现出更大的TSS积累，因此具有更多的负OP。灌溉和膨大恢复叶片后OA的维持在扩张叶片和扩张叶片中均很明显。尽管在不同的实验中，干旱条件下的OA和膨大恢复后的OA有所不同，但在Hyden品种和Monty的双倍单倍体中，在大小和稳定性方面都具有出色的OA能力，这表明选择该性状的潜力为以及通过单倍体化利用OA的可变性。

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