An efficient triose phosphate synthesis and distribution in wheat provides tolerance to higher field temperatures.
An efficient triose phosphate synthesis and distribution in wheat provides tolerance to higher field temperatures.
复制标题
小麦中有效的磷酸丙糖合成和分布提供了对较高田间温度的耐受性。
DOI：
10.1042/bcj20230117
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Romero-Reyes A
中科院分区：
文献类型：
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作者：
Romero-Reyes A
田间高温阻碍了面包小麦的高产生产，主要原因是热量对光合作用的不利影响。亚基山谷是墨西哥主要的小麦产区，是一个容易出现30摄氏度以上气温的地区。在田间条件下研究了10个小麦基因型在高温条件下旗叶光合性能的变化。该研究在两个季节（2019-2020年和2020-2021年）进行。在每个季节中，对照种子在12月播种，而热胁迫种子在1月下旬播种，使小麦在灌浆期受到热胁迫（HS）。HS使第一季的谷物产量从20%降低到58%。HS没有减少叶绿素含量和光依赖性反应不受影响的任何测试的基因型。采用酶法测定了Rubisco、叶绿体果糖1，6-二磷酸酶（FBPase）和蔗糖磷酸合成酶（SPS）的活性。Rubisco活性没有降低HS下的任何基因型。FBS酶活性被HS降低，表明磷酸丙糖流入淀粉合成减少，而SPS不受影响，因此，蔗糖合成得以维持。HS降低了10个基因型的地上生物量。基因型SOKWB。1，SOKWB. 3号和BORLAUG 100在HS处理下保持了产量，表明在该地区引种耐热面包小麦具有潜在的成功潜力。
High temperatures in the field hinder bread wheat high-yield production, mainly because of the adverse effects of heat over photosynthesis. The Yaqui Valley, the main wheat producer region in Mexico, is a zone prone to have temperatures over 30 C. The aim of this work was to test the flag leaf photosynthetic performance in 10 bread wheat genotypes grown under high temperatures in the field. The study took place during two seasons (2019-2020 and 2020-2021). In each season, control seeds were sown in December, while heat-stressed were sown in late January to subject wheat to heat stress (HS) during the grain-filling stage. HS reduced Grain yield from 20 to 58% in the first season. HS did not reduce chlorophyll content and light-dependent reactions were unaffected in any of the tested genotypes. Rubisco, chloroplast fructose 1, 6-biphosphatase (FBPase), and sucrose phosphate synthase (SPS) activities were measured spectrophotometrically. Rubisco activity did not decrease under HS in any of the genotypes. FBPase activity was reduced by HS indicating that triose phosphate flux to starch synthesis was reduced, while SPS was not affected, and thus, sucrose synthesis was maintained. HS reduced aerial biomass in the 10 chosen genotypes. Genotypes SOKWB. 1, SOKWB. 3, and BORLAUG100 maintained their yield under HS, pointing to a potential success in their introduction in this region for breeding heat-tolerant bread wheat.