Effect of Salinity Stress on Growth, Sugar Content, Pigments and Enzyme Activity of Rice
Effect of Salinity Stress on Growth, Sugar Content, Pigments and Enzyme Activity of Rice
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DOI：
10.3923/ijb.2011.73.81
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发表时间：
2011-01-01
期刊：
影响因子：
--
通讯作者：
Amirjani, Mohammad Reza
中科院分区：
文献类型：
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作者：
Amirjani, Mohammad Reza
在沿海和干旱灌溉水稻生产系统中，盐分是一个主要的减产因素。水稻秧苗。塔罗姆·阿兹穆恩暴露在200 mM的氯化钠中14天。对盐胁迫下生长的水稻幼苗的生长、相对含水量、色素和糖含量、光合作用效率和酶活性进行了研究，结果表明，盐胁迫处理的水稻幼苗地上部长度比对照减少了71%左右。盐分胁迫使幼苗根长增加。处理苗木的根长比对照增加约54%。处理苗的鲜重和干重分别下降到95%和75%。盐胁迫使叶片相对含水量从对照植株的87%下降到胁迫植株的74%。叶片经氯化钠处理后，叶片中的叶绿素a和b含量均有所下降。在盐胁迫下，叶片叶绿素b含量下降(41%)的影响大于叶绿素a含量(33%)的下降。光系统II的最大量子效率(F-v/F-m)、光系统II的光量子效率(Phi(PSII))、非光化学猝灭(NPQ)和净光合速率(Pn)均受到抑制，导致整体生长减慢。叶绿素a含量与Fv/Fm、总叶绿素含量与Phi(PSII)Pn、Pn与叶面积呈正相关。在盐分胁迫下，地上部含糖量显著增加。盐胁迫下幼苗根部淀粉含量降低。根中总糖、还原糖和非还原糖含量增加。
Salinity is a major yield-reducing factor in coastal and arid, irrigated rice production systems. Rice seedlings cv. Tarom Azmoon was exposed to 200 mM NaCl for 14 days. Plant growth, relative water content, pigment and sugars content, photosynthetic efficiency and enzyme activity of rice seedlings grown under salt stress were investigated Shoot length of treated seedlings decreased to about 71% compare to the control. Salinity stress caused an increase in root length of seedlings. Root length of treated seedlings was about 54% more than the control. Fresh weights and dry weights of treated seedlings reduced to 95 and 75%, respectively. Salinity stress caused reduction in leaf relative water contents from 87% in the control plants to 74% in the stressed plants. The reduction of chlorophyll a and b contents of leaves was detected after NaCl treatment in leaves. Under salt stress, reduction of the chlorophyll b content of leaves (41%) was more affected than the chlorophyll a content (33%). The maximum quantum yield of PSII (F-v/F-m), photon yield of PSII (phi(PSII)), non-photochemical quenching (NPQ) and net photosynthetic rate (Pn) in the stressed seedlings were inhibited, leading to overall growth reduction. The positive correlations between chlorophyll a content and Fv/Fm, total chlorophyll content and phi(PSII) Pn as well as Pn and leaf area were found. Sugar content in shoots had a significant increase under salinity stress. The starch content of roots seedlings decreased NaCl stressed seedling. The contents of total, reducing and non reducing sugars increased in roots.