美早甜樱桃不同生育期光合特性及果实品质
Photosynthetic characteristics and fruit quality of Tieton sweet cherry in different growth stages
目的 明确美早甜樱桃不同生长发育时期叶片需光特性与果实糖组分含量变化规律,为发挥出甜樱桃光合生产潜在优势提供理论依据。 方法 试验分别于美早甜樱桃幼果期、膨大期、转色期和成熟期测定叶片净光合速率(Pn)、蒸腾速率(Tr)和气孔导度(Gs)等光合生理生态指标,光响应曲线和果实品质。 结果 美早甜樱桃不同生育期Pn日变化均为双峰曲线,转色期不同生理生态因子显著高于幼果期、膨大期和成熟期(P<0.05),转色期光补偿点(LCP)也显著高于其他3个时期(P<0.05),成熟期光饱和点(LSP)显著高于幼果期、膨大期和转色期(P<0.05),此外,果实中葡萄糖和果糖,在果实发育前期呈现平稳积累期到转色期后含量均迅速增加,至果实成熟期其积累均减慢增加,山梨醇含量在果实整个发育时期内呈现逐渐增加的趋势。 结论 不同生育期美早甜樱桃Gs和Pn保持在同一水平上,在Pn和Gs下降时,Ci保持较低水平,导致气孔关闭,出现光合‘午休’现象,同时,随着叶片面积的增大,到果实转色期叶片利用弱光的能力较强,成熟期叶片利用光的范围较宽,此时果实中葡萄糖、果糖和山梨醇含量也迅速增加。
Objective To clarify the change of leaf light requirements and fruit sugar content in different growth and development stages of Tieton sweet cherry, to provide a theoretical basis for exerting the potential advantages of sweet cherry photosynthetic production. Method The photosynthetic physiological ecology of leaves, such as net photosynthetic rate (Pn), transpiration rate (Tr) and Stomatal conductance (Gs),were measured at the young fruit stage, swelling stage, color change stage and maturity stage of Tieton sweet cherry.The light response curves and fruit quality were also evaluated. Result The diurnal variation of Pn in different stages of fruit showed a bimodal curve, and different physiological and ecological factors were significantly higher in the color-changing stage than those in the young fruit stage,swelling stage and mature stage (P<0.05). The compensation point (LCP) was also significantly higher than the other three stages (P<0.05), and the light saturation point (LSP) in the mature stage was significantly higher than that in the young fruit stage,the expansion stage and the color changing stage (P<0.05).The contents of glucose and fructose increased rapidly in the early stage of fruit development and increased rapidly after the color-changing stage, and their accumulation slowed down and increased in the fruit maturity stage. The content of sorbitol increased gradually during the whole fruit development stage. Conclusion Gs and Pn of fruit remained at the same level in different growth stages.When Pn and Gs decreased, Ci remained at a lower level, resulting in the closure of stomata and the phenomenon of photosynthetic ‘noon break’.With the increase of the area, the ability of the leaves to use weak light is stronger at the stage of fruit color change, and the range of light utilization of leaves at the mature stage is wider.At this time, the content of glucose, fructose and sorbitol in the fruit also increases rapidly.
Tieton sweet cherry / different growth periods / diurnal changes in photosynthesis / light response
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