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Do brassinosteroids alleviate water stress in seedlings of Handroanthus serratifolius?
Annals of Applied Biology ( IF 2.2 ) Pub Date : 2021-07-19 , DOI: 10.1111/aab.12719 D.A. Vieira 1 , M.A. Toro‐Herrera 1 , A.M.C. Mendonça 2 , J.P.R.A.D. Barbosa 1
Annals of Applied Biology ( IF 2.2 ) Pub Date : 2021-07-19 , DOI: 10.1111/aab.12719 D.A. Vieira 1 , M.A. Toro‐Herrera 1 , A.M.C. Mendonça 2 , J.P.R.A.D. Barbosa 1
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Limited water availability in reforestation areas can compromise plant growth and development, especially for plants at early stages. In this context, the exogenous application of growth regulators, such as brassinosteroids (BRs), can be used to mitigate the negative effects of water restriction. The aim of this study was to evaluate the effect of the application of BRs (90% brassinolide + a brassinosteroid) on initial growth, gas exchange, leaf water potential and leaf anatomy in yellow Ipê (Handroanthus serratifolius), under water restriction conditions. Throughout the experimental period, plants were maintained in two different water regimes: WR1—plants maintained at 100% of the pot capacity; WR2—plants rehydrated with 50% of the evapotranspiration from the previous day. BRs were applied on three occasions during the experimental period, in five concentrations: C1, 0 g/L (application of distilled water); C2, 0.25 g/L; C3, 0.5 g/L; C4, 0.75 g/L; and C5, 1.00 g/L. The dry mass, root:shoot ratio, water status and leaf anatomy traits were evaluated at the end of the experimental period and were analysed in two-level factorial scheme (2WR × 5BRs concentrations). The plant height, number of leaves, gas exchange and leaf chlorophyll content were evaluated four times during the experimental period and were analysed in a split-split-plot design (two WR × five BRs concentrations × four evaluation times). The differences between the means were evaluated by analysis of variance (ANOVA). Pairs of means were separated using the standard error of the difference between the means (SED) and the Fisher's protected least significant difference test (LSD) at p < .05. In addition, all variables were subjected to regression analysis, being the variables evaluated over time, analysed through a two-stage modelling approach. The results obtained indicate that the water deficit led to reductions in growth and gas exchange parameters, regardless of the exogenous application of the regulator; therefore, higher concentrations (C4 and C5) were the most harmful for the maintenance of metabolic and photosynthetic activity. The exogenous application of BRs in H. serratifolius plants attenuated the effects of water limitation on the leaf water potential, but was not able to mitigate for the negative effects in growth, gas exchange and leaf anatomy.
中文翻译：
油菜素类固醇是否可以减轻锯齿红花幼苗的水分胁迫？
重新造林地区有限的可用水会影响植物的生长和发育，特别是对于处于早期阶段的植物。在这种情况下，外源性应用生长调节剂，如油菜素类固醇 (BRs)，可用于减轻限水的负面影响。本研究的目的是评估 BRs（90% 油菜素内酯 + 油菜素内酯）对黄色 Ipê ( Handroanthus serratifolius ) 初始生长、气体交换、叶水势和叶片解剖结构的影响)，在限水条件下。在整个实验期间，植物保持在两种不同的水分条件下： WR1——植物保持在 100% 的盆栽容量；WR2——植物用前一天蒸发量的 50% 进行再水化。在实验期间，BRs 应用了 3 次，五个浓度：C1，0 g/L（应用蒸馏水）；C2，0.25克/升；C3，0.5克/升；C4，0.75克/升；和 C5，1.00 克/升。在试验期结束时评估干重、根茎比、水分状况和叶片解剖特征，并在两级因子方案（2WR × 5BRs 浓度）中进行分析。株高、叶数、在实验期间，对气体交换和叶片叶绿素含量进行了四次评估，并在裂区设计中进行了分析（两个 WR × 5 个 BR 浓度 × 四个评估时间）。通过方差分析 (ANOVA) 评估平均值之间的差异。使用均值 (SED) 和 Fisher 受保护的最小显着性差异检验 (LSD) 之间的差异的标准误差来分离均值对p < .05。此外，所有变量都经过回归分析，即随时间评估的变量，通过两阶段建模方法进行分析。获得的结果表明，无论调节剂的外源应用如何，水分亏缺都会导致生长和气体交换参数的降低；因此，较高的浓度（C4 和 C5）对维持代谢和光合活性最有害。外源BRs在锯齿草植物中的应用减弱了水分限制对叶片水势的影响，但不能减轻对生长、气体交换和叶片解剖的负面影响。
更新日期：2021-07-19
中文翻译：
油菜素类固醇是否可以减轻锯齿红花幼苗的水分胁迫？
重新造林地区有限的可用水会影响植物的生长和发育，特别是对于处于早期阶段的植物。在这种情况下，外源性应用生长调节剂，如油菜素类固醇 (BRs)，可用于减轻限水的负面影响。本研究的目的是评估 BRs（90% 油菜素内酯 + 油菜素内酯）对黄色 Ipê ( Handroanthus serratifolius ) 初始生长、气体交换、叶水势和叶片解剖结构的影响)，在限水条件下。在整个实验期间，植物保持在两种不同的水分条件下： WR1——植物保持在 100% 的盆栽容量；WR2——植物用前一天蒸发量的 50% 进行再水化。在实验期间，BRs 应用了 3 次，五个浓度：C1，0 g/L（应用蒸馏水）；C2，0.25克/升；C3，0.5克/升；C4，0.75克/升；和 C5，1.00 克/升。在试验期结束时评估干重、根茎比、水分状况和叶片解剖特征，并在两级因子方案（2WR × 5BRs 浓度）中进行分析。株高、叶数、在实验期间，对气体交换和叶片叶绿素含量进行了四次评估，并在裂区设计中进行了分析（两个 WR × 5 个 BR 浓度 × 四个评估时间）。通过方差分析 (ANOVA) 评估平均值之间的差异。使用均值 (SED) 和 Fisher 受保护的最小显着性差异检验 (LSD) 之间的差异的标准误差来分离均值对p < .05。此外，所有变量都经过回归分析，即随时间评估的变量，通过两阶段建模方法进行分析。获得的结果表明，无论调节剂的外源应用如何，水分亏缺都会导致生长和气体交换参数的降低；因此，较高的浓度（C4 和 C5）对维持代谢和光合活性最有害。外源BRs在锯齿草植物中的应用减弱了水分限制对叶片水势的影响，但不能减轻对生长、气体交换和叶片解剖的负面影响。
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