Gas film retention and underwater photosynthesis during field submergence of four contrasting rice genotypes.
Gas film retention and underwater photosynthesis during field submergence of four contrasting rice genotypes.
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DOI：
10.1093/jxb/eru166
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发表时间：
2014-07
影响因子：
6.9
通讯作者：
Colmer TD
中科院分区：
文献类型：
--
作者：
Winkel A;Pedersen O;Ella E;Ismail AM;Colmer TD
耐淹基因型FR 13 A保留了叶片气膜和水下净光合能力，而敏感基因型的气膜损失更快，光合作用明显下降。洪水可使水稻（Oryza sativa L.）领域的水稻的叶子上有一层气体膜，可以帮助水中的O2和CO2交换。本研究探讨了基因型和淹水时间对气膜持续性和水下净光合作用（PN）的影响。四个对比的基因型（FR 13 A，IR 42，Swarna，和Swarna-Sub1）淹没了13天，在现场和叶气膜，叶绿素，并在近环境和高CO2的水下PN的能力进行了评估与时间的淹没。在高CO2在PN试验期间，所有基因型最初表现出较高的水下PN率，这一比率不受FR 13 A的淹没时间。FR 13 A的这种上级光合性能在Swarna-Sub1（携带SUB1 QTL）中不明显，Swarna-Sub1和Swarna的水下PN下降与IR 42相同。在接近环境CO2浓度，水下PN下降，在所有四个基因型，这对应于损失的叶片气膜随时间的淹没。FR 13 A保持叶片气膜的时间比其他基因型稍长，但气膜保持与SUB1无关。应筛选不同的水稻种质在淹水期间的气膜持久性，因为这一特性可能会增加碳水化合物的状态和内部通气，由于增加水下PN，这有助于水稻耐淹。
The flood-tolerant genotype FR13A retains leaf gas films and its capacity for underwater net photosynthesis, whereas gas films are lost faster and photosynthesis declines markedly in sensitive genotypes. Floods can completely submerge some rice (Oryza sativa L.) fields. Leaves of rice have gas films that aid O2 and CO2 exchange under water. The present study explored the relationship between gas film persistence and underwater net photosynthesis (PN) as influenced by genotype and submergence duration. Four contrasting genotypes (FR13A, IR42, Swarna, and Swarna-Sub1) were submerged for 13 days in the field and leaf gas films, chlorophyll, and the capacity for underwater PN at near ambient and high CO2 were assessed with time of submergence. At high CO2 during the PN assay, all genotypes initially showed high rates of underwater PN, and this rate was not affected by time of submergence in FR13A. This superior photosynthetic performance of FR13A was not evident in Swarna-Sub1 (carrying the SUB1 QTL) and the declines in underwater PN in both Swarna-Sub1 and Swarna were equal to that in IR42. At near ambient CO2 concentration, underwater PN declined in all four genotypes and this corresponded with loss of leaf gas films with time of submergence. FR13A retained leaf gas films moderately longer than the other genotypes, but gas film retention was not linked to SUB1. Diverse rice germplasm should be screened for gas film persistence during submergence, as this trait could potentially increase carbohydrate status and internal aeration owing to increased underwater PN, which contributes to submergence tolerance in rice.
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影响因子：
5.6
作者：
Pedersen O;Colmer TD;Sand-Jensen K
通讯作者：
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