Response of Photosynthesis in Maize to Drought and Re-Watering

Genetic dissection of photosynthetic performances in maize under drought-stressed and well-watered environments

“…1). It could be concluded that the drought-induced limitation of photosynthesis in maize was primarily due to CO 2 diffusion e ciency from sub-stomatal interval internal cavities to carboxylation site in chloroplasts and degree of SC, and increasing evidences in maize also supported our results by Liu et al [5],Veroneze-Júnior et al [41], Perdomo et al [42], and He et al [4]. Therefore, genetic improvement of photosynthetic performances in maize can be applied to MAS breeding to improve drought tolerance and high-yielding in the future.…”

“…Although a wealth of information from previous researches considerably improved our understanding of leaf photosynthetic performances [43][44][45], as well as applications in maize MAS breeding [5,9,18,35], few studies considered the genetic basis of maize photosynthetic-related traits under water de ct at the molecular level [20][21][22]. Based on the above considerations, in this study we detected 54 QTLs for six photosynthetic-related traits across two F 4 populations via single watering environment mapping with CIM ( Fig.…”

“…Maize as an important C 4 crop, and its highly complex mechanism of phoptosynthetic performance is one of the main targets for improving maize grain yield (GY) and drought resistance. He et al [4], Liu et al [5] and Zhao et al [6] reported that net ohotosynthetic rate (Pn), chlorophyll relative content (SPAD), chlorophyll a content (FCa), chloroohyll b content (FCb), total chlorophyll content (FCt), ribulose 1,5-biphosphate carboxylase activity (RuBP), stomatal conductance (Gs), and transpiration rate (Tr) in maize were signi cantly reduced, meanwhile chloroohy a/b (FCa/b), intercellular CO 2 concentration (Ci) and water use effeciency (WUE) were signi cantly increased under drought stress, and compared with drought sensitive materials, stronge drought resistant maize could maintain higher photosynthetic capacity in drought land. Zhang et al [7] suggested moderate and severe drought stress caused an obvious decrease in Pn, Gs, and RuBP, caused a signi cant increase in Ci, damaged photosytem II (PSII) , reduced electron transport in diverse maize varieties.…”

Genetic dissection of photosynthetic performances in maize under drought-stressed and well-watered environments

“…Although a wealth of information from previous researches considerably improved our understanding of leaf photosynthetic performances [43][44][45], as well as applications in maize MAS breeding [5,9,18,35], few studies considered the genetic basis of maize photosynthetic-related traits under water defict at the molecular level [20][21][22]. Based on the above considerations, in this study we detected 54 QTLs for six photosynthetic-related traits across two F4 populations via single watering environment mapping with CIM ( Fig.…”

“…Maize as an important C4 crop, and its highly complex mechanism of phoptosynthetic performance is one of the main targets for improving maize grain yield (GY) and drought resistance. He et al [4], Liu et al [5] and Zhao et al [6] reported that net ohotosynthetic rate (Pn), chlorophyll relative content (SPAD), chlorophyll a content (FCa), chloroohyll b content (FCb), total chlorophyll content (FCt), ribulose 1,5-biphosphate carboxylase activity (RuBP), stomatal conductance (Gs), and transpiration rate (Tr) in maize were significantly reduced, meanwhile chloroohy a/b (FCa/b), intercellular CO2 concentration (Ci) and water use effeciency (WUE) were significantly increased under drought stress, and compared with drought sensitive materials, stronge drought resistant maize could maintain higher photosynthetic capacity in drought land. Zhang et al [7] suggested moderate and severe drought stress caused an obvious decrease in Pn, Gs, and RuBP, caused a significant increase in Ci, damaged photosytem II (PSII) , reduced electron transport in diverse maize varieties.…”