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首页> 外文期刊>Plant Protection Science >Effect of MgSO4 nutrition on Theobroma cacao L. susceptibility to Phytophthora megakarya infection
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Effect of MgSO4 nutrition on Theobroma cacao L. susceptibility to Phytophthora megakarya infection

机译：硫酸镁营养对可可杆菌对巨大疫霉菌感染的影响。

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A new strategy to reduce the severity of black pod disease (BPD) in T. cacao plants using MgSOsub4/sub nutrition was investigated. The dynamics of the tolerance to BPD of 18 susceptible T. cacao plantlets coming from the cross (♀SNK64 × ♂UPA14) was monitored during weekly (8 weeks) supply of MgSOsub4/sub into the soil. Prior to MgSOsub4/sub application, disease scores of the 18 plantlets (in six sets of three plantlets per set) were varying between 3.5 (susceptible) and 5 (highly susceptible). After MgSOsub4 /subapplication, a substantial decrease in disease scores was observed compared to the control. The percentage of disease tolerance gain of plantlets versus MgSOsub4/sub supplied (0–2.96 g) presented a quasi-hyperbolic curve with asymptotic line corresponding to 60% (day 28) and 70% (day 56). Cysteine content was not significantly different between the six triplets before MgSOsub4 /subnutrition. On days 28 and 56 of MgSOsub4/sub supplementation, cysteine content presented a pattern similar to the tolerance gain of plantlet sets. The monitoring of glutathione content versus MgSOsub4/sub supplementation (compared to day 0) showed sigmoid (day 28) and hyperbolic (day 56) curves which were associated with defined mathematical laws determined by MALAB software. Negative and highly significant correlations were observed between disease scores, cysteine and glutathione contents in leaves while positive and highly significant correlations were observed between cysteine and glutathione contents in leaves. These data might mean that MgSOsub4/sub nutrition significantly improved the tolerance of T. cacao. The mechanism of tolerance improvement might be associated with the synthesis of sulphur-containing compounds (cysteine and glutathione) which might be directly or indirectly used by T. cacao against P. megakarya.
机译：研究了一种利用硫酸镁 4 营养降低可可豆植株黑荚病严重程度的新策略。在每周（8周）向土壤中供应MgSO 4 的过程中，监测了18个来自杂交（♀SNK64×♂UPA14）的易感丁香树幼苗对BPD的耐受性动态。在施用MgSO 4 之前，这18株小植株（每组3株小植株中有6株）的疾病评分在3.5（易感）和5（易感）之间变化。施用MgSO 4 后，与对照组相比，疾病得分显着下降。幼苗相对于所供应的MgSO 4 （0–2.96 g）的抗病性增加的百分比呈准双曲线，渐近线分别对应于60％（第28天）和70％（第56天）。在MgSO 4 营养之前，六个三胞胎之间的半胱氨酸含量没有显着差异。在补充MgSO 4 的第28天和第56天，半胱氨酸含量呈现出类似于幼苗集的耐性增加的模式。监测谷胱甘肽含量与添加MgSO 4 的比较（与第0天相比）显示出S型曲线（第28天）和双曲线（第56天），这与MALAB软件确定的数学定律有关。叶片的疾病评分，半胱氨酸和谷胱甘肽含量之间呈负相关和高度显着相关，而叶片中的半胱氨酸和谷胱甘肽含量之间呈负相关和高度显着相关。这些数据可能意味着MgSO 4 营养显着提高了可可豆的耐受性。耐受性提高的机制可能与含硫化合物（半胱氨酸和谷胱甘肽）的合成有关，它们可能被可可丁香直接或间接地用于对抗巨大假单胞菌。

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