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首页> 外文期刊>African Journal of Biotechnology >Effects of soil flooding on photosynthesis and growth of Zea mays L. seedlings under different light intensities
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Effects of soil flooding on photosynthesis and growth of Zea mays L. seedlings under different light intensities

机译：不同光强下水淹对玉米幼苗光合作用和生长的影响

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Soil flooding is one of the major abiotic stresses that repress maize (Zea mays?L.) growth and yield, and other environmental factors often influence soil flooding stress.This paper reports an experimental test of the hypothesis that light intensity can influence the responses of maize seedlings to soil flooding. In this experiment, maize seedlings were subjected to soil flooding at?the?two-leaf stage under control?light (600 μmol m-2?s-1)?or low light?(150 μmol m-2?s-1)?conditions.?Under control light growth conditions, the average photosynthetic rate?(PN),?transpiration rate?(E)?and?water use efficiency (WUE) were 70, 26 and 59%, respectively, higher in non-flooded than in flooded seedlings;?and the?average?chlorophyll?a?(Chl?a),?chlorophyll?b?(Chl?b) and Chla+b?were 31, 42 and 34%, respectively, higher in non-flooded than in flooded seedlings; and the average belowground biomass and total biomass were 52 and 34%, respectively, higher in non-flooded than in flooded seedlings. There was a slight decrease of seedling biomass in six days flooded seedlings under low light growth conditions. The effects of flooding on photosynthetic,?seedling growth?and shoot/root ratio?were more pronounced under control light growth conditions than under low light growth conditions, which?indicate that?even for maize which is a C4?plant, relatively high?light intensity?still?aggravated soil flooding stress, while low light growth conditionmitigated soil flooding stress, and suggests that light effects should be considered when we study maize responses to soil flooding.
机译：土壤淹水是抑制玉米生长和产量的主要非生物胁迫之一，其他环境因素也经常影响土壤淹水胁迫。本文报道了关于光强度会影响玉米响应的假说的实验测试。玉米幼苗向土壤泛滥。在该实验中，玉米幼苗在“双叶期”的控制下（600μmolm-2？s-1）或弱光（150μmolm-2？s-1）进行水淹。在控制光生长条件下，非淹水的平均光合速率（PN），蒸腾速率（E）和水分利用效率（WUE）分别为70％，26％和59％。相比淹水的幼苗，平均叶绿素a（Chlαa），叶绿素b（Chlb）和Chla +bα的平均分别高31％，42％和34％。水淹比幼苗泛滥;非淹水地下平均生物量和总生物量分别为52％和34％，高于淹水幼苗。在弱光条件下，淹水6天的幼苗幼苗生物量略有下降。在低光照条件下，淹水对光合作用，“幼苗生长”和苗/根比的影响要比低光照条件下更为显着，这表明即使是C4植物的玉米也相对较高。光照强度仍使土壤淹水胁迫加剧，而低光照生长条件则减轻了土壤淹水胁迫，这表明研究玉米对土壤淹水的响应时应考虑光照效应。

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