Allan Lopes Bacha, Renata Thaysa da Silva Santos, Juliana de Souza Rodrigues, Willians César Carrega, Esther Carrera Bergua, Timothy Lane Grey, Pedro Luís da Costa Aguiar Alves
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引用次数: 0
摘要
尽管最近的研究报道了乙基三羟甲基丙酸(TE)对桉树生长的刺激作用,但对于促进这种反应的最佳剂量还没有达成共识。由于 TE 在赤霉素(GA)生物合成途径中发挥作用,因此研究叶片和芽尖之间的激素串扰可为理解之前报道的积极效应提供重要信息。我们评估了 TE 在不同土壤湿度条件下(充分浇水-WW 和 40% 田间能力-40-FC)的剂量-反应曲线、其对植物生理的影响以及叶片和 SAB 之间的激素串扰。TE 使 WW 条件下的桉树生长量增加了 49%,但对 40-FC 条件下的植物没有影响。估计对 WW 桉树植物产生最大刺激作用的剂量为 202 克活性成分/公顷-1。TE 在施用后 15 天(DAA)内都不会增加植物的光合特性,这表明桉树的初级新陈代谢会在施用后增加。与单子叶作物的报道相反,作为短期效应(05 DAA),TE 使叶片 GA1 增加了五倍,但却显著降低了 SAB-GA1 的浓度。叶片中的吲哚-3-乙酸、水杨酸、脱落酸和 N6-异戊烯基腺嘌呤浓度也有所增加。TE 以器官特异性的方式引起了 13-羟基化(GA20、GA1 和 GA8)和非 13-羟基化(GA9、GA4 和 GA34)GA 代谢途径的变化。我们的研究结果为在桉树种植园中使用这种植物生长调节剂提供了信息支持,同时也揭示了叶片和 SAB 之间的激素串扰对 TE 的反应。
Trinexapac-Ethyl Dose–Response Curve for Eucalyptus Growth and Hormonal Crosstalk Between Leaf and Shoot Apical Bud
Although recent studies have reported stimulatory effect of trinexapac-ethyl (TE) on eucalyptus growth, there is no consensus regarding the best dose to promote this response. Since TE acts in the gibberellin (GA) biosynthesis pathway, the study of hormonal crosstalk between the leaves and the shoot apical bud (SAB) can provide important information for understanding the positive effect previously reported. We evaluate the TE dose–response curve for eucalyptus growth in different soil moisture conditions (well watered—WW and 40% of field capacity—40-FC) and its effects on plant physiology, as well as the hormonal crosstalk between the leaves and SAB. TE caused a 49% increase in WW eucalypt growth, but not to plants under 40-FC. Estimated dose for the greatest stimulatory effect on WW eucalypt plants is 202 g a.i. ha−1. TE did not cause an increase in the plants' photosynthetic characteristics up to 15 days after application (DAA), suggesting a later increase in the eucalypt’s primary metabolism. Conversely to what have been reported for monocot crops, TE caused a fivefold increase in leaf GA1 as a short-term effect (05 DAA), but significantly decreased SAB-GA1 concentration. Leaf concentrations of indole-3-acetic acid, salicylic acid, abscisic acid and N6-isopentenyladenine also increased. TE caused changes in both 13-hydroxylated (GA20, GA1 and GA8) and non-13-hydroxylated (GA9, GA4 and GA34) GA metabolic pathways in an organ-specific manner. Our results provide information to support the use of this plant growth regulator in eucalyptus plantations, as well as insights into the hormonal crosstalk between leaves and SAB in response to TE.
期刊介绍:
The Journal of Plant Growth Regulation is an international publication featuring original articles on all aspects of plant growth and development. We welcome manuscripts reporting question-based research on various aspects of plant growth and development using hormonal, physiological, environmental, genetic, biophysical, developmental and/or molecular approaches.
The journal also publishes timely reviews on highly relevant areas and/or studies in plant growth and development, including interdisciplinary work with an emphasis on plant growth, plant hormones and plant pathology or abiotic stress.
In addition, the journal features occasional thematic issues with special guest editors, as well as brief communications describing novel techniques and meeting reports.
The journal is unlikely to accept manuscripts that are purely descriptive in nature or reports work with simple tissue culture without attempting to investigate the underlying mechanisms of plant growth regulation, those that focus exclusively on microbial communities, or deal with the (elicitation by plant hormones of) synthesis of secondary metabolites.