ABSTRACT

Covering fig trees with color nets changed the quality of light that reach trees. This study was carried out to assess the effects of shade provided by blue and yellow protection nets on leaf attributes and fruit quality of fig trees under rain-fed conditions. The experiment lasted for three months and was a split-plot treatment arrangement in a randomized complete block design with three replications. ‘Sabz’ and ‘Siah’ fig trees were covered with color nets or left uncovered (as the control group). The results showed that yellow nets reduced the net photosynthetic activity by 15.86 µmol CO₂ m⁻² s⁻¹, but increased leaf chlorophyll and carotenoid content in both cultivars. Leaf temperature decreased in both cultivars when covered with yellow nets. The shade provided by blue nets increased stomatal conductance in the leaves of ‘Sabz’ fig trees. When covered with yellow shade nets, ‘Sabz’ fig trees had the highest relative water content and the lowest ion leakage in both cultivars. The color nets reduced dry fruit diameter in ‘Sabz’ figs and reduced total soluble solids in both cultivars. Also, titratable acidity decreased in fruits as a result of using yellow nets on both cultivars. Yellow nets increased antioxidant activity and anthocyanin content in fruits of the ‘Siah’ cultivar significantly, as compared with the ‘Sabz’ cultivar. The photo-selective, light-dispersive shade nets proved to be interesting tools that can reduce drought stress on trees under rain-fed conditions.

摘要

用彩色网覆盖无花果树改变了到达树木的光线质量。本研究旨在评估在雨养条件下，蓝色和黄色防护网提供的遮荫对无花果树的叶片特性和果实品质的影响。实验持续了三个月，是随机完整区组设计中的裂区处理安排，三个重复。'Sabz' 和 'Siah' 无花果树被彩色网覆盖或不加遮盖（作为对照组）。结果表明，黄网使净光合活性降低了 15.86 µmol CO ₂ m ^-2 s ^-1，但增加了两个品种的叶绿素和类胡萝卜素含量。当用黄网覆盖时，两个品种的叶温都会降低。蓝色网提供的阴影增加了“Sabz”无花果树叶子中的气孔导度。当用黄色遮阳网覆盖时，'Sabz' 无花果树在两个品种中的相对含水量最高，离子泄漏量最低。色网减少了“Sabz”无花果的干果直径，并减少了两个品种的总可溶性固形物。此外，由于在两个品种上使用黄网，水果的可滴定酸度降低。与 'Sabz' 品种相比，黄网显着增加了 'Siah' 品种果实的抗氧化活性和花青素含量。照片选择性，