College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, PR China.
J Exp Bot. 2013 Apr;64(7):2107-16. doi: 10.1093/jxb/ert067. Epub 2013 Mar 25.
This study investigated the comparative effects of reduced irrigation regimes--partial root-zone drying (PRD) and conventional deficit irrigation (DI)--on the incidence of blossom-end rot (BER) in tomato (Solanum lycopersicum L.) under three Ca-fertilization rates: 0, 100, and 200mg Ca kg(-1) soil (denoted Ca0, Ca1, and Ca2, respectively). The plants were grown in split-root pots in a climate-controlled glasshouse and treated with PRD and DI during early flowering to the fruit maturity stage. The results showed that, in comparison with DI treatment, PRD significantly reduced BER incidence. A greater xylem sap abscisic acid concentration, lower stomatal conductance, and higher plant water status in the PRD in relation to the DI plants might have contributed to the increased fruit Ca uptake, and could have reduced BER development in tomato fruits. Therefore, under conditions with limited freshwater resources, application of PRD irrigation could be a promising approach for saving water and for preventing BER development in tomatoes.
本研究调查了在三种钙施肥率（分别为 0、100 和 200mg Ca kg(-1) 土壤，记为 Ca0、Ca1 和 Ca2）下，减少灌溉制度——部分根区干燥（PRD）和常规亏缺灌溉（DI）对番茄（Solanum lycopersicum L.）发生花端腐烂（BER）的比较影响。植物在分根盆中生长，并在开花早期到果实成熟阶段进行 PRD 和 DI 处理。结果表明，与 DI 处理相比，PRD 显著降低了 BER 发生率。PRD 中木质部汁液脱落酸浓度较高、气孔导度较低和植物水分状况较好，可能导致果实中钙吸收增加，从而减少番茄果实 BER 的发生。因此，在淡水资源有限的情况下，应用 PRD 灌溉可能是一种有前途的节水方法，可防止番茄 BER 的发生。
