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首页> 外文期刊>Journal of Experimental Botany >Enhanced seed production under prolonged heat stress conditions in Arabidopsis thaliana plants deficient in cytosolic ascorbate peroxidase 2
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Enhanced seed production under prolonged heat stress conditions in Arabidopsis thaliana plants deficient in cytosolic ascorbate peroxidase 2

机译：缺乏胞质抗坏血酸过氧化物酶2的拟南芥植物在延长的热胁迫条件下提高了种子产量

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Reactive oxygen species play a key role in the response of plants to abiotic stress conditions. Their level is controlled in Arabidopsis thaliana by a large network of genes that includes the H2O2-scavenging enzymes cytosolic ascorbate peroxidase (APX) 1 and 2. Although the function of APX1 has been established under different growth conditions, genetic evidence for APX2 function, as well as for the mode of cooperation between APX1 and APX2, is very limited. This study characterized the response of Arabidopsis mutants deficient in APX1, APX2, and APX1/APX2 to heat, salinity, light, and oxidative stresses. The findings reveal that deficiency in APX2 resulted in a decreased tolerance to light stress, as well as an enhanced tolerance to salinity and oxidative stresses. Interestingly, plants lacking APX2 were more sensitive to heat stress at the seedling stage, but more tolerant to heat stress at the reproductive stage. Cooperation between APX1 and APX2 was evident during oxidative stress, but not during light, salinity, or heat stress. The findings demonstrate a role for APX2 in the response of plants to light, heat, salinity, and oxidative stresses. The finding that plants lacking APX2 produced more seeds under prolonged heat stress conditions suggests that redundant mechanisms activated in APX2-deficient plants during heat stress play a key role in the protection of reproductive tissues from heat-related damage. This finding is very important because heat-associated damage to reproductive tissues in different crops is a major cause for yield loss in agriculture production worldwide.Digital Object Identifier http://dx.doi.org/10.1093/jxb/ers335
机译：活性氧在植物对非生物胁迫条件的响应中起关键作用。它们的水平在拟南芥中是由一个大型基因网络控制的，该基因网络包括清除H 2 O 2 清除酶胞质抗坏血酸过氧化物酶（APX）1和2。已经在不同的生长条件下确定了APX1的功能，关于APX2功能以及APX1和APX2之间合作模式的遗传证据非常有限。这项研究的特点是缺乏APX1，APX2和APX1 / APX2的拟南芥突变体对热，盐度，光和氧化胁迫的响应。这些发现表明，APX2的缺乏导致对光胁迫的耐受性降低，以及对盐分和氧化胁迫的耐受性增强。有趣的是，缺少APX2的植物在苗期对热胁迫更敏感，但在生殖期对热胁迫更耐受。 APX1和APX2之间的协同作用在氧化胁迫下很明显，而在光照，盐度或热胁迫下则不明显。这些发现证明了APX2在植物对光，热，盐度和氧化胁迫的响应中的作用。缺乏APX2的植物在长时间的热胁迫条件下会产生更多的种子，这一发现表明，在热胁迫期间APX2缺陷型植物中激活的冗余机制在保护生殖组织免受热相关损害中起着关键作用。这一发现非常重要，因为与热相关的不同作物的生殖组织受损是导致全球农业生产减产的主要原因。数字对象标识符http://dx.doi.org/10.1093/jxb/ers335

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