Responses of non-structural carbohydrates accumulation and distribution of Caragana microphylla seedlings to drought stress
Responses of non-structural carbohydrates accumulation and distribution of Caragana microphylla seedlings to drought stress
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DOI：
10.13292/j.1000-4890.201711.016
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发表时间：
2017-11-01
期刊：
影响因子：
--
通讯作者：
Zhao Li-ren
中科院分区：
文献类型：
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作者：
Lei Hong;Wang Kai;Zhao Li-ren
为了解非结构性碳水化合物（NSC）对干旱胁迫的响应，以2年生小叶锦鸡儿（Caragana microphylla）幼苗为试材，设置4个不同水分处理（适宜水分、轻度、中度和重度干旱胁迫，即田间持水量的80%、60%、40%和20%）处理15、30、45和60 d。结果表明，干旱胁迫程度和持续时间对苦楝叶、茎、粗根和细根的可溶性糖、淀粉和总非淀粉含量存在显著的互作效应。小叶苗轻度干旱胁迫下，各器官可溶性糖、淀粉和总NSC含量在处理第30天均显著低于适宜水分处理。处理60 d时细根可溶性糖含量和粗根淀粉含量显著高于适宜水分处理。中度干旱胁迫下，茎和粗根中可溶性糖含量先显著低于适宜水分处理，然后逐渐升高。同时，与轻度干旱胁迫相比，中度干旱胁迫下叶、茎和细根中可溶性糖含量增加，茎和粗根中淀粉含量下降。严重干旱胁迫下，处理第15 d各器官淀粉含量显著低于适宜水位下，处理第60 d显著高于适宜水位下。这些结果表明C.小叶章幼苗通过调节不同器官NSC含量的积累和分配来适应不同的干旱环境。
To understand the response of non-structural carbohydrates (NSC) to drought stress, two-year-old Caragana microphylla seedlings were planted in four different water treatments (suitable water level, mild, moderate and serious drought stress, i.e., 80%, 60%, 40% and 20% of field water-holding capacity) for 15, 30, 45 and 60 days. The results showed that there were significant interacting effect between drought stress degree and duration on the contents of soluble sugar, starch and total NSC of leaves, stems, coarse and fine roots of C. microphylla seedlings. Under mild drought stress, the soluble sugar, starch and total NSC contents in each organ were significantly lower than those under suitable water level on the 30th day of treatment. Moreover, the soluble sugar content in fine roots and starch content in coarse roots were significantly higher than those under suitable water level on the 60th day of treatment. Under moderate drought stress, the soluble sugar content in stems and coarse roots was firstly significantly lower than that under suitable water level, and then it gradually increased. Meanwhile, compared with mild drought stress, the soluble sugar content in leaves, stems and fine roots increased while the starch content in stems and coarse roots decreased under moderate drought stress. Under serious drought stress, the starch content in each organ was significantly lower than that under suitable water level on the 15th day of treatment, and it was significantly higher than that under suitable water level on the 60th day of treatment. These results indicated that C. microphylla seedlings adapted to different drought environments by adjusting accumulation and distribution of NSC contents in different organs.