遮光和乙烯利对温室栽培“大久保”桃结果枝碳同化物分配的影响

以4年生日光温室栽培“大久保”桃为试材,采用14C标记的方法,研究了60%遮光处理和果面喷施600mg/L乙烯利后结果枝同化物分配和相对库强的变化。结果表明:果实成熟期遮荫处理10d后,从饲喂新梢分配到果实的碳同化物比例明显减少;硬核期遮光后,果实碳分配比例变化不明显,但种子分配比例明显减少。遮光处理后,各器官相对库强的变化趋势与同化物的分配比例基本一致。在果实成熟期喷施乙烯利后,显著提高了遮光结果枝果实同化物分配比例和相对库强。

EFFECTS OF SHADING AND ETHEPHON ON CARBON ASSIMILATES DISTRIBUTION PARTITIONING IN FRUIT LIMB OF GREENHOUSE-GROWN 'DAJIUBAO' PEACH

The distribution of carbon assimilates and the relative sink strength were studied by()~(14)C labeling in one-year-old fruiting limbs of greenhouse-grown `Dajiubao' peach(Prunus persica L.Batsch),under 60% shading and 600mg/L Ethephon treatment.After 10d shading treatment prior to pulsing of()~(14)CO_2 percent of assimilates translocation into fruit decreased significantly from fed shoot during fruit-ripening stage,but this partitioning patterns was not observed during stone-hardening stage,although less carbon allocated to seed within fruit components(mesocarp,endocarp and seed).The relative sink strength of each organ nearly followed the same variation trend as carbon assimilats distribution under shading treatment.Application of Ethephon to the surface of fruits under shading conditions promoted more carbon into fruits during fruit-ripening stage, with increasing their relative sink strength.