雅斯莫纳酸介导的吉伯雷林催化作用限制了在米中草食动物攻击期间的生长
Gaochen Jin1, Jinfeng Qi2, Hongyue Zu1
1State Key Laboratory of Rice Biology, Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Key Laboratory of Biology of Crop Pathogens and Insects of Zhejiang Province, Institute of Insect Sciences, Zhejiang University, Hangzhou 310058, China.
The Plant cell
|July 1, 2023
概括
在大米中,雅斯蒙酸 (JA) 信号通过增加吉伯雷林 (GA) 分解来优先考虑在棕色植物 (BPH) 攻击期间的防御而不是生长. 这种机制有助于植物在面对草食时有效地重新分配资源.
科学领域:
- 植物生物学 植物生物学
- 植物与昆虫的相互作用
- 分子植物科学 分子植物科学
背景情况:
- 植物对草食动物的防御需要付出相当大的成本,往往导致抑制生长.
- 植物激素斯酸盐 (JA) 对于平衡草食动物攻击期间的防御和生长至关重要,但其精确的机制尚未完全理解.
研究的目的:
- 阐明莉酸盐 (JA) 信号调节植物生长抑制的分子机制,以应对大米中棕色植物 (BPH) 感染.
- 调查 gibberellin (GA) 代谢在中介JA诱导的生长抑制在草食过程中的作用.
主要方法:
- 对大米 (Oryza sativa) 对棕色虫 (Nilaparvata lugens) 感染的反应进行分析.
- 植物激素水平 (JA和GA) 的量化和基因表达分析 (GA2-氧化酶基因).
- 基因操纵 (突变体和过度表达线) 和分子测试 (促进体结合分析).
主要成果:
- 米中BPH感染导致非活性吉伯雷林 (GA) 的水平增加和GA2-氧化酶 (GA2ox) 基因 (GA2ox3和GA2ox7) 的上调.
- 在GA2ox基因中的突变可以减少BPH诱导的生长抑制,而不会影响抗性.
- JA信号积极调节GA2ox表达,MYC2直接与GA2ox促进体结合.
结论:
- 雅斯莫纳酸 (JA) 信号通过GA2ox基因激活吉伯雷林 (GA) 代谢,导致草食动物攻击期间的生长抑制.
- 这种JA介导的GA催化是优化压力下的植物资源分配的关键机制.
- 这项研究揭示了JA和GA通路在植物防御中的关键交叉声.
相关概念视频
Cell Signaling in Plants
5.7K
Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
5.7K
Defenses Against Pathogens and Herbivores
23.9K
Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a proper immune system, have developed an array of constitutive and inducible defenses to fend off these attacks.
23.9K
Plant Hormones
24.3K
Plant hormones—or phytohormones—are chemical molecules that modulate one or more physiological processes of a plant. In animals, hormones are often produced in specific glands and circulated via the circulatory system. However, plants lack hormone-producing glands.
24.3K
Adaptations that Reduce Water Loss
25.8K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
25.8K
Regulation of Transpiration by Stomata
28.5K
During photosynthesis, plants acquire the necessary carbon dioxide and release the produced oxygen back into the atmosphere. Openings in the epidermis of plant leaves is the site of this exchange of gasses. A single opening is called a stoma—derived from the Greek word for “mouth.” Stomata open and close in response to a variety of environmental cues.
28.5K
Biological Clocks and Seasonal Responses
34.8K
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
34.8K


