根域限制栽培对库尔勒香梨光合、荧光特性及果实品质的影响

【目的】研究根域限制栽培模式对库尔勒香梨叶片光合和荧光特性及果实品质的影响，为塔里木盆地绿洲干旱盐碱区域库尔勒香梨的栽培提供理论依据和技术指导。【方法】以8年生库尔勒香梨为试材，比较根域限制栽培模式与传统的根系互享栽培模式的叶片光合特性和果实品质差异，研究库尔勒香梨根域限制栽培模式的可行性。【结果】2种栽培模式下，库尔勒香梨叶片的Pn日变化曲线均呈“双峰”型，存在明显的光合午休现象，根域限制栽培的库尔勒香梨叶片Pn日平均值高于传统根系互享栽培模式，Gs和Tr相对较低，不同模式间差异不显著。Ci日平均值显著低于、E_wu日平均值显著高于传统模式，对照组的Ci日均值高于限根植株，达203.93μL/L,并且两实验组之间存在显著差异。不同栽培模式对库尔勒香梨水分利用率有较为显著的影响，限根植株的E_wu日均值达1.36 mmol/mol,两者之间存在显著差异。限根植株的Fo、Fm、Fv/Fm、Fv/Fm、Φ_PSⅡ、C_NPQ均大于传统栽培模式。限根植株的果实品质与对照组单果重、果实硬度、可溶性固形物差异不显著，...

Effects of Root-restricted Cultivation on Photosynthesis,Fluorescence Characteristics and Fruit Quality of Korla Fragrant Pear

【Objective】 To clarify the effects of rhizosphere restricted cultivation mode on leaf photosynthetic and fluorescence characteristics and fruit quality of Korla pear, and provide technical support for the cultivation of Korla pear in arid and salt-alkali area of tarim Basin oasis. 【Methods】 In order to explore the feasibility of 8-year korla pear, leaf photosynthetic characteristics and fruit quality were compared between root zone restricted cultivation mode and traditional root sharing cultivation mode. 【Results】 Under the two cultivation modes, the diurnal variation curve of Pn of Korla pear leaves showed a "double peak" pattern, and there was an obvious photosynthetic nap phenomenon. The daily average value of Pn of Korla pear leaves under the root domain limited cultivation mode was higher than that under the traditional root sharing cultivation mode, while the Gs and Tr were relatively low, and there was no significant difference between different cultivation modes. The Ci daily average was significantly lower than the traditional model, while the Ewu daily average was significantly higher than the traditional model. Fo, Fm, Fv/Fm, Fv/Fm, Φ_PSⅡ and C_NPQ of limited root were all higher than those of traditional cultivation. There were no significant differences in fruit quality, fruit hardness, soluble solids and stone cell content between root limiting plants and control group. 【Conclusion】 The root zone restricted cultivation mode could improve the light capture ability and net photosynthetic rate of korla pear leaves, improve water use efficiency, and significantly reduce the content of fruit stone cells. Comprehensive analysis could be used as a new cultivation mode of Korla pear in the arid and salt-alkali area of tarim Basin oasis.