Kaolin Particle Film and Water Deficit Influence Malbec Leaf and Berry Temperature, Pigments, and Photosynthesis

摘要: The effects of kaolin particle film on traits commercial interest in the red-skinned winegrape cultivar Malbec (Vitis vinifera L.) were evaluated over three growing seasons by measuring surface temperatures leaves and clusters, leaf-level assimilation, leaf berry pigment composition, yield vines grown under differing severities water deficit with without a foliar coating film. irrigated standard or reduced amount arid field conditions high solar radiation. Particle increased concentration total monomeric anthocyanins berries each year ratio to soluble solids at harvest two out years. did not alleviate differences anthocyanin between east- west-exposed clusters. In irrigation, decreased cumulative minutes that exceeded 30°C mid-July through but east-exposed leaves. Leaves had lower midmorning rates chlorophyll-a chlorophyll-b ratio, higher chlorophylls carotenoids than Decreased assimilation was unrelated magnitude reflectance visible light. affect components fruit maturity, indicating net primary productivity sufficient ripen maturity. These results demonstrate can facilitate accumulation deficit-irrigated warm,