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首页> 美国卫生研究院文献>Journal of Experimental Botany >Older Thinopyrum intermedium (Poaceae) plants exhibit superior photosynthetic tolerance to cold stress and greater increases in two photosynthetic enzymes under freezing stress compared with young plants
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Older Thinopyrum intermedium (Poaceae) plants exhibit superior photosynthetic tolerance to cold stress and greater increases in two photosynthetic enzymes under freezing stress compared with young plants

机译：与幼小植物相比中古Thinopyrum intermedium（禾本科）植物表现出优异的对冷胁迫的光合耐受性并且在冷冻胁迫下两种光合酶的增加更大

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Effects of plant age on resource acquisition and stress tolerance processes is a largely unstudied subject in herbaceous perennials. In a field experiment, we compared rates of photosynthesis (A), ribulose-1,5-bisphosphate (RuBP) carboxylation capacity (V Cmax), maximum electron transport rate (J max), and triose phosphate utilization (TPU), as well as concentrations of Rubisco and sucrose-phosphate synthase (SPS) in 5-year-old and 2-year-old intermediate wheatgrass (Thinopyrum intermedium) under both optimal growing conditions and cold stress in early spring and autumn. This species is a relative of wheat undergoing domestication. An additional experiment compared photosynthetic rates in different cohorts at mid-season and under colder conditions. We hypothesized that photosynthetic capacity in older plants would be lower under favorable conditions but higher under cold stress. Our hypothesis was generally supported. Under cold stress, 5-year-old plants exhibited higher A, TPU, and temperature-adjusted V Cmax than younger plants, as well as 50% more SPS and 37% more Rubisco. In contrast, at mid-season, photosynthetic capacities in older plants were lower than in younger plants in one experiment, and similar in the other, independent of differences in water status. Both cohorts increased A, temperature-adjusted TPU and J max, [Rubisco], and [SPS] under cold stress, but changes were greater in older plants. Photosynthetic differences were largest at 1.2 ºC in very early spring, where older plants had 200% higher A and maintained up to 17% of their peak photosynthetic capacity. We find evidence of increased cold tolerance in older cohorts of wheatgrass, consistent with a growing body of research in woody perennials.
机译：在草本多年生植物中，植物年龄对资源获取和胁迫耐受性过程的影响是很大程度上未被研究的主题。在野外实验中，我们比较了光合作用速率（A），核糖1,5-双磷酸（RuBP）羧化能力（V Cmax），最大电子传输速率（J max）和磷酸三糖利用率（TPU）在最佳生长条件和早春和秋季的冷胁迫下，5岁和2岁的中间小麦草（Thinopyrum intermedium）中Rubisco和蔗糖磷酸合成酶（SPS）的浓度。该物种是正在驯化的小麦的近缘种。另一个实验比较了不同人群在季节中期和寒冷条件下的光合速率。我们假设，在有利条件下，老龄植物的光合作用能力会降低，而在冷胁迫下会更高。我们的假设得到了普遍支持。在冷胁迫下，比起年轻植物，具有5年历史的植物表现出更高的A，TPU和经温度调节的V Cmax，并且具有更高的SPS和50％的Rubisco含量。相反，在一个实验中，处于季节中期，老龄植物的光合能力低于年轻植物，而另一项则相似，这与水状况的差异无关。在冷胁迫下，两个队列均增加了A，温度调节的TPU和J max，[Rubisco]和[SPS]，但在老龄植物中变化更大。在非常早的春天，光合作用的差异最大，为1.2ºC，其中较老的植物具有更高的A值，并保持了其峰值光合能力的17％。我们发现，较老的小麦草群体对寒冷的耐受性增强，这与木质多年生植物的研究不断增加是一致的。

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