摘要
为了比较不同居群白羊草(Bothriochloa ischaemum)不同生育期的光合特性,筛选出光合特性较好的居群及其最佳利用时期,运用Li-6400光合仪测定了平鲁、平定、代县、太谷4个居群的白羊草在不同生育期的净光合速率(P_n)、蒸腾速率(T_r)、气孔导度(G_s)、胞间CO_2浓度(C_i)、水分利用率(WUE)等参数。运用灰色关联度法对4个居群在5个时期的光合指标进行综合评价,结果表明,平鲁、平定、代县、太谷4个居群的P_n、T_r、G_s在不同生育期的表现存在显著差异(P<0.05),太谷居群5个生育期的Ci及Gs(除结实期外)均大于其他3个居群,4个居群各个时期P_n、T_r、G_s、C_i、WUE的均值,均以太谷居群最高。除平定居群开花期及4个居群结实期综合光合特性表现较差外(综合排序较低),平定、代县居群以孕穗期各指标综合特性表现最好,太谷居群以开花期综合光合特性最优,平鲁居群整体具中等光合特性,其他时期也表现中等。从生育期看,白羊草以抽穗期光合特性表现良好。
In order to compare the photosynthetic characteristics of old world bluestem( Bothriochloa ischaemum) populations at different stages of growth,populations with good photosynthetic characteristics and their best utilization periods were chosen. In this study,the Li-6400 photosynthesis system was used to measure the net photosynthetic rate( P_n),transpiration rate( T_r),stomatal conductance( G_s),intercellular CO2 concentration( C_i),water use efficiency( WUE),and other parameters of old world bluestems belonging to the Pinglu,Pingding,Dai County,and Taigu populations,at different stages of growth. The photosynthetic indices of the four different old world bluestem populations at five different growth stages were analyzed and evaluated comprehensively by the grey correlative system. The results showed that the values of Pn,Tr,and Gssignificantly differed among the Pinglu,Pingding,Dai County,and Taigu populations at different stages of growth( P < 0. 05). The Ciand Gsof the Taigu population were higher than those of the other three populations at the five growth stages,with the exception of Gsat the ripening stage. The average values of Pn,Tr,Gs,Ci,and WUE at each stage were the highest in the Taigu population. Additionally,among the four populations of old world bluestem,the poorest photosynthetic characteristics were observed for the Pingding population at anthesis and ripening stages,while the Pingding and Dai County populations showed the poorest characteristics at the booting stage. The best photosynthetic characteristics were observed for the Taigu population at the anthesis stage; all stages of the Pinglu population exhibited medium photosynthetic characteristics. With respect to the growth stages,old world bluestem had good photosynthetic characteristics at the heading stage( 0. 6000 < Δi< 0. 7000).
出处
《草业科学》
CAS
CSCD
2018年第3期597-605,共9页
Pratacultural Science
基金
山西省科技攻关项目(20120311011-1)
山西省科技基础条件平台建设项目(2012091004-0101)
关键词
白羊草
生育期
光合速率
灰色关联度
蒸腾速率
气孔导度
胞间CO2
old world bBluestem(Bothriochloa ischaemum)
growth stage
photosynthetic rate
grey relational grade
transpiration rate
leaf stomatal conductance
intercellular CO2 concentration
