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首页> 外文期刊>African Journal of Biotechnology >Difference in photosynthetic performance among three peach cultivars grown under low light conditions in greenhouses
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Difference in photosynthetic performance among three peach cultivars grown under low light conditions in greenhouses

机译：温室弱光条件下三个桃品种光合性能的差异

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The effects of low photosynthetic photon flux density (PPFD) on greenhouse grown peach trees (‘Qingfeng’:?Prunus persica?L. Batsch, ‘NJN76’:?Prunus persica?L. Batsch and ‘Maixiang’:?P. persica?var. nectarine) were investigated. Difference in photosynthesis rate (Pn) and stoma morphology among cultivars were studied. Furthermore, chlorophyll content, leaf thickness and photosynthesis enzyme activity were analyzed. Results showed that when PPFD was reduced to 80% of control, Pn decreased in all three cultivars. The reduced net photosynthesis rate was associated with decreased stoma density, stoma aperture and stoma conductance (Cs), as well as chlorophyll?a?(Chla) and?b?(Chlb) content in all cultivars; leaf mass per unit area (LMA) and thickness of upper and lower layers of leaf epidermis also declined. At 80% PPFD, the variation pattern of ribulose bisphosphate carboxylase (RuBPCase), Ca2+-adenosinetriphosphatase (Ca2+-ATPase) and Mg2+- adenosine triphosphatase (Mg2+-ATPase) activities, together with nicotinamide adenine dinucleotide phosphate (NADPH) content and photosynthetic O2?evolution rate among the three cultivars was the same as the pattern of LMA. Time course analysis showed that the net photosynthesis rate of ‘Maixiang’ was higher than that of the other two cultivars from 10:00 to 14:00. Though the parameters mentioned above decreased under shade in all the three cultivars, ‘Maixiang’ still had higher Pn than that of the other two cultivars. Our results indicated that ‘Maixiang’ is probably more suitable to grow in low PPFD than ‘Qingfeng’ and ‘NJN76’, especially in the early spring season in order to get higher market value.
机译：低光合光子通量密度（PPFD）对温室种植桃树的影响（'Qingfeng'：？Prunus persica？L.Batsch，'NJN76'：？Prunus persica？L.Batsch and'Maixiang'：？P。persica？油桃）。研究了不同品种光合速率（Pn）和气孔形态的差异。此外，分析了叶绿素含量，叶片厚度和光合作用酶活性。结果表明，当PPFD降至对照的80％时，所有三个品种的Pn均下降。净光合速率降低与所有栽培品种的气孔密度，气孔孔径和气孔导度（Cs）降低以及叶绿素aa（Chla）和bb（Chlb）含量降低有关。单位面积的叶片质量（LMA）和叶片表皮的上，下层厚度也有所下降。 PPFD为80％时，核糖双磷酸羧化酶（RuBPCase），Ca2 +-腺苷三磷酸酶（Ca2 + -ATPase）和Mg2 +-腺苷三磷酸酶（Mg2 + -ATPase）活性的变化模式，以及烟酰胺腺嘌呤二核苷酸磷酸（NADPH）的含量和光合速率三个品种之间的进化速率与LMA模式相同。时程分析表明，“麦香”的净光合速率在10:00至14:00之间高于其他两个品种。尽管上述参数在所有三个品种中均在阴影下下降，但“麦香”的Pn仍高于其他两个品种。我们的结果表明，“麦香”可能比“庆丰”和“ NJN76”更适合低PPFD的生长，尤其是在春季初期，以便获得更高的市场价值。

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