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Photosynthesis by six portuguese maize cultivars during drought stress and recovery

机译:六个葡萄牙玉米品种在干旱胁迫和恢复过程中的光合作用

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摘要

Photosynthesis, chlorophyll fluorescence and leaf water parameters were measured in six Portuguese maize (Zea mays L.) cultivars during and following a period of drought stress. The leaf relative water content (RWC) responded differently among cultivars but, except for cultivar PB369, recovered close to initial values after watering was restored. Photosynthetic rate and stomatal conductance decreased with drought but more slowly in cultivars PB269 and PB260 than in cultivars AD3R, PB64, PB304 and PB369. Water use efficiency (WUE) decreased during the water stress treatment although with cultivar PB260 the decrease was marked only when the RWC fell below 40%. Recovery of WUE was seen with all cultivars except PB369. The maximum quantum efficiency of photosystem II, the photochemical quenching coefficient, the electron transport rate in PSII and the estimated functional plastoquinone pool tended to decrease with drought, while the non -photochemical quenching coefficient increased. The parameters estimated from chlorophyll fluorescence did not recover in PB369, during re - watering. The results show that PB260 and PB269 were the most tolerant and PB369 was the least tolerant cultivars to water stress. The variation found amongst the cultivars tested suggests the existence of valuable genetic resources for crop improvement in relation to drought tolerance.
机译:在干旱胁迫期间和之后,对六个葡萄牙玉米(Zea mays L.)品种的光合作用,叶绿素荧光和叶片水分参数进行了测量。不同品种的叶片相对含水量(RWC)的响应不同,但除PB369品种外,恢复浇水后恢复到接近初始值。干旱导致光合速率和气孔导度下降,但PB269和PB260品种比AD3R,PB64,PB304和PB369品种更慢。在水分胁迫处理过程中,水分利用效率(WUE)下降,尽管使用PB260品种时只有在RWC低于40%时才明显下降。除PB369外,所有其他品种均观察到WUE的恢复。光系统II的最大量子效率,光化学猝灭系数,PSII中的电子传输速率以及估计的功能性质体醌库随干旱而降低,而非光化学猝灭系数则升高。在再浇水期间,从叶绿素荧光估计的参数在PB369中未恢复。结果表明,PB260和PB269对水分胁迫的耐受性最高,而PB369对水分胁迫的耐受性最低。在测试的品种中发现的变异表明存在与干旱耐受性相关的有价值的遗传资源,可用于作物改良。

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