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首页> 外文期刊>Journal of Chemical Ecology >Plant Density and Nutrient Availability Constrain Constitutive and Wound-induced Expression of Trypsin Inhibitors in Brassica napus
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Plant Density and Nutrient Availability Constrain Constitutive and Wound-induced Expression of Trypsin Inhibitors in Brassica napus

机译：植物密度和养分利用率限制甘蓝型油菜中胰蛋白酶抑制剂的组成型和伤口诱导表达

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摘要

We investigated the effects of plant density on plant size, leaf total soluble protein content, and constitutive and wound-induced levels of proteinaceous trypsin inhibitors in pot-grown Brassica napus seedlings in two greenhouse studies. We manipulated plant density by varying the number of intraspecific neighbors surrounding a target plant in the center of each pot. In general, constitutive and induced levels of trypsin inhibitors were significantly reduced by competition in a density-dependent manner, to the extent that induction was greatly reduced or abolished in target plants surrounded by six neighbors. To investigate whether the effects of plant density on inhibitor production were mediated by nutrient availability, we manipulated the concentration of a complete fertilizer applied to target plants surrounded by six neighbors in two greenhouse studies. In general, constitutive and wound-induced levels of inhibitors in plants surrounded by six neighbors were increased by nutrient addition in a dose-dependent manner, such that wound-induction was completely restored in competing plants under conditions of high nutrient availability. Leaf total soluble protein content, measured only in the second trial of each experiment, was not affected by any of the treatments. The effects of plant density, nutrient addition, and wounding on inhibitor levels in all experiments were independent of their effecs on above-ground plant size at the time of wounding. Overall, our results suggest that decreasing nutrient availability mediates the density-dependent reductions in inhibitor levels in B. napus seedings.
机译：在两个温室研究中，我们调查了盆栽的甘蓝型油菜幼苗中植物密度对植物大小，叶片总可溶性蛋白含量以及组成型和伤口诱导型蛋白质胰蛋白酶抑制剂水平的影响。我们通过改变每个盆中心目标植物周围种内邻居的数量来控制植物密度。通常，通过竞争以密度依赖性的方式显着降低了胰蛋白酶抑制剂的组成型和诱导水平，其程度是在被六个邻居包围的靶植物中诱导被大大降低或消除了。为了研究植物密度对抑制剂生产的影响是否由养分的可利用性来介导，我们在两个温室研究中操纵了施用于目标植物的完全肥料的浓度，该目标植物被六个邻居包围。通常，通过添加养分以剂量依赖的方式增加被六个邻居包围的植物中抑制剂的组成型和伤口诱导水平，从而在高养分利用率的条件下在竞争植物中完全恢复了伤口诱导。仅在每个实验的第二次试验中测得的叶片总可溶性蛋白质含量不受任何处理的影响。在所有实验中，植物密度，养分添加和伤害对抑制剂水平的影响均与伤害时其对地上植物大小的影响无关。总体而言，我们的结果表明，养分利用率的降低介导了甘蓝型油菜种子中抑制剂水平的密度依赖性降低。

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