Enhanced seed production under prolonged heat stress conditions in Arabidopsis thaliana plants deficient in cytosolic ascorbate peroxidase 2.
Enhanced seed production under prolonged heat stress conditions in Arabidopsis thaliana plants deficient in cytosolic ascorbate peroxidase 2.
复制标题
拟南芥植物在延长的热应激条件下增强了种子的产生，缺乏胞质抗坏血酸过氧化物酶2。
DOI：
10.1093/jxb/ers335
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发表时间：
2013-01
影响因子：
6.9
通讯作者：
Mittler R
中科院分区：
文献类型：
--
作者：
Suzuki N;Miller G;Sejima H;Harper J;Mittler R
活性氧在植物对非生物胁迫条件的反应中发挥着关键作用。在拟南芥中，它们的水平受到大型基因网络的控制，其中包括 H2O2 清除酶胞质抗坏血酸过氧化物酶 (APX) 1 和 2。尽管 APX1 的功能已在不同的生长条件下确定，但 APX2 功能以及 APX1 和 APX2 之间合作模式的遗传证据非常有限。本研究表征了 APX1、APX2 和 APX1/APX2 缺陷的拟南芥突变体对热、盐度、光和氧化应激的反应。研究结果表明，APX2 缺陷会导致对光胁迫的耐受性降低，以及对盐度和氧化应激的耐受性增强。有趣的是，缺乏APX2的植物在苗期对热应激更敏感，但在生殖阶段对热应激更耐受。 APX1 和 APX2 之间的合作在氧化应激期间很明显，但在光、盐或热应激期间则不然。研究结果表明 APX2 在植物对光、热、盐度和氧化应激的反应中发挥着重要作用。缺乏 APX2 的植物在长期热应激条件下产生更多种子的发现表明，缺乏 APX2 的植物在热应激期间激活的冗余机制在保护生殖组织免受热相关损伤方面发挥着关键作用。这一发现非常重要，因为不同作物生殖组织的热相关损伤是全球农业生产产量损失的主要原因。
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.
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影响因子：
6.9
作者：
Frank G;Pressman E;Ophir R;Althan L;Shaked R;Freedman M;Shen S;Firon N
通讯作者：
Firon N
影响因子：
6.9
作者：
Bechtold, Ulrike;Richard, Odile;Mullineaux, Philip M.
通讯作者：
Mullineaux, Philip M.
影响因子：
5.1
作者：
Schramm, F;Ganguli, A;von Koskull-Döring, P
通讯作者：
von Koskull-Döring, P
影响因子：
4.8
作者：
Suzuki, Nobuhiro;Bajad, Sunil;Mittler, Ron
通讯作者：
Mittler, Ron
影响因子：
7.2
作者：
Fryer, MJ;Ball, L;Baker, NR
通讯作者：
Baker, NR