Chlorophyll fluorescence parameters, CO2 photosynthetic rate and regeneration capacity as a result of complete submergence and subsequent re-emergence in rice (Oryza sativa L.)
Chlorophyll fluorescence parameters, CO2 photosynthetic rate and regeneration capacity as a result of complete submergence and subsequent re-emergence in rice (Oryza sativa L.)
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DOI：
10.1016/j.aquabot.2007.08.012
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发表时间：
2008-02-01
期刊：
影响因子：
1.8
通讯作者：
Sarkar, R. K.
中科院分区：
文献类型：
--
作者：
Panda, Debabrata;Sharma, Sri Gopal;Sarkar, R. K.
以耐淹水稻品种FR-13A、Kalaputia和IR-42为材料，研究了水稻淹水苗的CO2光合作用速率、叶绿素a荧光、叶绿素和碳水化合物含量等指标的再生能力。将21天的植株完全浸入水中8天。随后，植株保持在正常条件下，土壤表面上有5-10厘米的积水，继续保持15天。完全淹水后，所有品种的CO2光合作用均受到抑制。淹水处理显著降低了Rubisco的活性。淹水条件下，光系统II的最大光化学效率(F-v/F-m)和荧光曲线上方的面积下降幅度较大，尤其是感病品种IR 42。当重新充气时，这些植物都有不同程度的恢复。植物的碳水化合物含量与耐淹性和再生生长呈显著正相关。耐淹品种(FR 13A)淹水前后的非结构性碳水化合物含量分别是感病品种(IR 42)的1.9~2.0倍和3.2~3.7倍，在淹水后恢复光合作用的能力较强。(C)2007 Elsevier B.V.保留所有权利。
Regeneration capacity of submerged rice (Oryza sativa) seedlings in terms of CO2 photosynthetic rate, chlorophyll a fluorescence and chlorophyll and carbohydrate content were investigated in three Indica rice cultivars namely FR 13A, Kalaputia and IR 42 that differed in submergence tolerance. Twenty-one day old plants were completely submerged under water for 8 days. Subsequently, plants were kept under normal conditions with 5-10 cm of stagnant water above soil surface for a further period of 15 days. After complete submergence, all genotypes showed inhibition Of CO2 photosynthetic rate. Submergence treatment resulted in a significant reduction of Rubisco activity. Maximal photochemical efficiency (F-v/F-m) of PS II and area above the fluorescence curve between F-o and F-m decreased more under submergence especially in susceptible cultivar IR 42. When re-aerated, the plants recovered to various degrees. The carbohydrate content of plants was found to be significantly and positively associated with submergence tolerance and regeneration growth. The tolerant cultivar (FR 13A) could survive submergence apparently because it possessed 1.9-2.0 and 3.2-3.7-fold more non-structural carbohydrate content before and after submergence compared to the susceptible cultivar (IR 42) and it had a better capability to restore its photosynthetic capacity during post-submergence periods. (c) 2007 Elsevier B.V. All rights reserved.