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首页> 外文期刊>Plant physiology >Rapid low temperature-induced stomatal closure occurs in cold-tolerantCommelina communis leaves but not in cold-sensitive tobacco leaves, via amechanism that involves apoplastic calcium but not abscisic acid
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Rapid low temperature-induced stomatal closure occurs in cold-tolerantCommelina communis leaves but not in cold-sensitive tobacco leaves, via amechanism that involves apoplastic calcium but not abscisic acid

机译：快速低温诱导的气孔关闭发生在耐寒的Commelina communis叶片中，而不是在感冒敏感的烟草叶片中发生，这是通过涉及质外钙而不是脱落酸的机制引起的。

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摘要

Commelina communis stomata closed within 1 h of transferring intact plants from 27 degreesC to 7 degreesC, whereas tobacco (Nicotiana rustica) stomata did not until the leaves wilted. Abscisic acid (ABA) did not mediate cold-induced C. communis stomatal closure: At low temperatures, bulk leaf ABA did not increase; ABA did not preferentially accumulate in the epidermis; its flux into detached leaves was lower; its release from isolated epidermis was not greater; and stomata in epidermal strips were less sensitive to exogenous ABA. Stomata of both species in epidermal strips on large volumes of cold KCI failed to close unless calcium was supplied. Therefore, the following cannot be triggers for cold-induced stomatal closure in C. communis: direct effects of temperature on guard or epidermal cells, long-distance signals, and effects of temperature on photosynthesis. Low temperature increased stomatal sensitivity to external CaCl2 by 50% in C. communis but only by 20% in tobacco. C. communis stomata were 300- to 1,000-fold more sensitive to calcium at low temperature than tobacco stomata, but tobacco epidermis only released 13.6-fold more calcium into bathing solutions than C. communis. Stomata in C. communis epidermis incubated on ever-decreasing volumes of cold calcium-free KCI closed on the lowest volume (0.2 cm(3)) because the epidermal apoplast contained enough calcium to mediate closure if this was not over diluted. We propose that the basis of cold-induced stomatal closure exhibited by intact C. communis leaves is increased apoplastic calcium uptake by guard cells. Such responses do not occur in chill-sensitive tobacco leaves.
机译：将完整植物从27摄氏度转移到7摄氏度，在1小时内关闭了Commelina communis气孔，而直到叶子枯萎为止，烟草（Nicotiana Rusta）气孔才关闭。脱落酸（ABA）不会介导寒冷诱导的C. Comm。气孔闭合：在低温下，散叶ABA不会增加;在低温下，散叶ABA不会增加。 ABA没有优先积累在表皮中。其进入离体叶片的通量较低;它从孤立的表皮中释放不多;表皮条中的气孔和气孔对外源ABA的敏感性较低。除非供应钙，否则在大量冷KCI上的表皮条中的两种气孔均无法闭合。因此，以下不能触发冷诱导的C. communis气孔关闭：温度对保卫或表皮细胞的直接影响，远距离信号以及温度对光合作用的影响。低温使C. com.is的气孔对外部CaCl2的敏感性增加了50％，但在烟草中仅增加了20％。低温下，普通孔菌对钙的敏感性比烟草孔高300到1,000倍，但是烟草表皮在沐浴液中的钙释放量仅比普通孔菌高13.6倍。在不断减少的冷无钙KCI上孵育的C. communis表皮气孔在最小体积（0.2 cm（3））上封闭，因为表皮质外体包含足够的钙以调节封闭度（如果未过度稀释）。我们提出完整的C. Comm。叶片表现出的冷诱导气孔关闭的基础是保卫细胞的质外钙吸收增加。这种反应在对寒冷敏感的烟叶中不会发生。

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