Photosynthetic characteristics and chlorophyll a fluorescence induction parameters in elite clone (GS1) of Pinus sylvestris var. mongolica

Photosynthetic characteristics and chlorophyll a fluorescence induction parameters in elite clone (GS1) of Pinus sylvestris var. mongolica
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樟子松优良无性系(GS1)光合特性及叶绿素a荧光诱导参数

DOI:
10.32615/ps.2019.133
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发表时间:
2020-03
期刊:
影响因子:
2.7
通讯作者:
You G. C.
You G. C.
中科院分区:
生物学4区
文献类型:
--
作者:
Meng P.;You G. C.

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我们选择了樟子松优良无性系。从辽宁省中国初级种子园的365个无性系中筛选出蒙古牧草‘Gs1’。为了了解光合作用的特征和机理,在同一种子园中,将40年生的‘GS1’树与同龄的普通无性系‘H524’进行了比较。结果表明,‘GS1’由于气孔导度较高而具有较高的净光合速率,气孔外径和内径较大是维持较高气孔导度的结构因素。‘GS1’光饱和净光合速率较高的主要原因是电子传递活性较高,表现为O级至P级的相对荧光强度较低。活性反应中心密度的增加导致单位面积能量通量的增加,从而导致更高的光合作用性能。
We selected the elite clone of Pinus sylvestris var. mongolica 'GS1' from 365 clones in a primary seed orchard in Liaoning Province, China. To understand the photosynthesis characteristics and mechanisms, 40-year-old 'GS1' trees were compared with a common clone 'H524' of the same age at the same seed orchard. Results showed that 'GS1' had higher net photosynthetic rate because of higher stomatal conductance (gs); the larger external and inner diameters of stomata were the structural factors enabling maintenance of higher gs. The higher light-saturated net photosynthetic rate of 'GS1' was mainly due to higher electron transfer activity, demonstrated by the lower relative fluorescence intensity from O-step to P-step. The increase in density of active reaction centers resulted in an increase in energy flux per cross section, which led to higher photosynthetic performance.
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