Bollier N, Micol-Ponce R, Dakdaki A, Maza E, Zouine M, Djari A, Bouzayen M, Chevalier C, Delmas F, Gonzalez N, Hernould M
INRAE, Université de Bordeaux, BFP, Bordeaux, France.
Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, Toulouse INP, Toulouse, France.
Front Plant Sci. 2023 Oct 25;14:1278608. doi: 10.3389/fpls.2023.1278608. eCollection 2023.
Climate change is one of the biggest threats that human society currently needs to face. Heat waves associated with global warming negatively affect plant growth and development and will increase in intensity and frequency in the coming years. Tomato is one of the most produced and consumed fruit in the world but remarkable yield losses occur every year due to the sensitivity of many cultivars to heat stress (HS). New insights into how tomato plants are responding to HS will contribute to the development of cultivars with high yields under harsh temperature conditions. In this study, the analysis of microsporogenesis and pollen germination rate of eleven tomato cultivars after exposure to a chronic HS revealed differences between genotypes. Pollen development was either delayed and/or desynchronized by HS depending on the cultivar considered. In addition, except for two, pollen germination was abolished by HS in all cultivars. The transcriptome of floral buds at two developmental stages (tetrad and pollen floral buds) of five cultivars revealed common and specific molecular responses implemented by tomato cultivars to cope with chronic HS. These data provide valuable insights into the diversity of the genetic response of floral buds from different cultivars to HS and may contribute to the development of future climate resilient tomato varieties.
气候变化是人类社会当前需要面对的最大威胁之一。与全球变暖相关的热浪对植物生长发育产生负面影响，且在未来几年其强度和频率还会增加。番茄是世界上产量和消费量最大的水果之一，但由于许多品种对热胁迫敏感，每年都会出现显著的产量损失。对番茄植株如何应对热胁迫的新见解将有助于培育在恶劣温度条件下高产的品种。在本研究中，对11个番茄品种在长期热胁迫处理后的小孢子发生和花粉萌发率进行分析，结果显示不同基因型之间存在差异。根据所考虑的品种不同，热胁迫会使花粉发育延迟和/或不同步。此外，除了两个品种外，所有品种的花粉萌发都因热胁迫而被抑制。对五个品种在两个发育阶段（四分体花芽和花粉花芽）的花芽转录组分析揭示了番茄品种应对长期热胁迫所采取的共同和特定分子反应。这些数据为不同品种花芽对热胁迫的遗传反应多样性提供了有价值的见解，并可能有助于未来培育适应气候变化的番茄品种。
