Partition of photoassimilates in banana cultivars irrigated with water of different salinities

Abstract Water salinity besides affecting growth and plant development may affect mineral nutrition and characteristics of soils. In a field experiment, the production and partition of dry matter of two banana (Musa spp) cultivars irrigated with high (ECw = 1.66 dS m-1) and low (ECw = 0,31 dS m-1) salinity up to 300 days after transplanting were evaluated, with the objective to identify the difference of photoassimilates partition for the two waters. It was verified that the partition of assimilates in the different organs of the plants was influenced with growing period and there was no difference in the production of biomass of leaves for the cultivars words to the end of the first cycle of the banana. It was verified that the plants irrigated with water of low salinity, the partition of photoassimilates in the bunch and in the rhizome presented diferences for the cultivars.

摘要：水的盐度不仅会影响作物生长与植株发育，还可对植物的矿质营养状况及土壤特性造成影响。本田间试验以两个芭蕉属（Musa spp）香蕉品种为供试材料，分别采用高盐度（ECw=1.66 dS·m⁻¹）与低盐度（ECw=0.31 dS·m⁻¹）的灌溉水进行灌溉，对移栽后300天内的植株干物质生产与分配情况开展评估，旨在明确两种灌溉水条件下植株光合产物（photoassimilates）分配的差异。研究证实，植株不同器官的同化物分配受生育期影响；在香蕉首个生长周期结束时，两个供试品种的叶片生物量产量无显著差异。此外，采用低盐度水灌溉的植株，其果簇与根状茎中的光合产物分配在不同品种间存在显著差异。