Water deficit enhancement of proline and α‐amino nitrogen accumulation in potato plants and its association with susceptibility to drought
Water deficit enhancement of proline and α‐amino nitrogen accumulation in potato plants and its association with susceptibility to drought
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马铃薯植株水分亏缺增强脯氨酸和α-氨基氮积累及其与干旱敏感性的关系
DOI：
10.1111/j.1399-3054.1983.tb00749.x
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发表时间：
1983
影响因子：
6.4
通讯作者：
D. Levy
中科院分区：
文献类型：
--
作者：
D. Levy
马铃薯（Solanum tuberosum L.）cvs“Up-to-Date”、“Desiree”、“Alpha”、“Spunta”、“Elvira”和“Troubadour”）在生长期间暴露于水分胁迫和缓解的循环。严重水分亏缺诱导马铃薯刚开始萎蔫的非膨叶脯氨酸含量增加6 ~ 7倍，完全萎蔫的叶片脯氨酸含量增加8 ~ 27倍。然而，脯氨酸含量没有受到影响，在早期阶段的压力发展的范围内的渗透势在叶片中。脯氨酸含量的上升与叶片的膨压损失有关，而与渗透势的变化无关，这表明脯氨酸不太可能参与马铃薯叶片的膨压调节。
重复的水分胁迫和缓解循环导致部分品种块茎组织中脯氨酸和α-氨基氮含量增加。脯氨酸含量的增加幅度最小的是'阿尔法'块茎，α-氨基态氮含量不受水分胁迫的影响。同时，'阿尔法'是最耐旱的品种，确定其能力，在胁迫条件下积累干物质的块茎。另一方面，在对干旱敏感的品种中，脯氨酸和α-氨基态氮的含量在水分胁迫下显著增加。这些研究结果与马铃薯耐受反复短时间干旱的可能关联进行了讨论。
Potato plants (Solanum tuberosum L. cvs ‘Up-to-Date’, ‘Desiree’, ‘Alpha’, ‘Spunta’, ‘Elvira’ and ‘Troubadour’) were exposed to cycles of water stress and relief during growth. Severe water deficit induced increased proline content 6- to 7-fold in nonturgid leaves which just started to wilt, and 8- to 27-fold in fully wilted leaves of potatoes. However, proline content was not affected during the early stages of stress development over a range of osmotic potentials in the leaves. The rising proline content was related to turgor loss of leaves independent of changes in the osmotic potentials, which indicates that proline involvement in osmoregulation of potato leaves is unlikely.
Repeated cycles of water stress and relief resulted in increased proline and α-amino nitrogen content in the tuber tissue of some of the cultivars. The smallest increase in proline content was obtained in ‘Alpha’ tubers and the content of α-amino nitrogen remained unaffected by the water stress. Concomitantly, ‘Alpha’ was the most drought-tolerant cultivar, as determined by its capacity to accumulate dry matter in tubers under stress conditions. On the other hand, in tubers of cultivars which were more susceptible to drought, a marked increase in proline and α-amino nitrogen was observed in response to water stress. The possible association of these findings with tolerance of potatoes to repeated short periods of drought is discussed.