The genetic diversity of 79 accessions regenerated from ＂miniature seeds＂ of loquat （Eriobotrya japonica Lindl. cv. ＇Dawuxing＇） was analyzed based on 13 morphological characteristics of leaves in this study, in ...The genetic diversity of 79 accessions regenerated from ＂miniature seeds＂ of loquat （Eriobotrya japonica Lindl. cv. ＇Dawuxing＇） was analyzed based on 13 morphological characteristics of leaves in this study, in order to provide important morphological basis for breeding new varieties and materials through ＂miniature seed＂ breeding method in loquat. The results showed that there was abundant genetic diversity in leaf morphological characteristics of regenerated plants （D=0.785）, especially indicated by diversity indexes of leaf length （D=0.991）, leaf width （D=0.994）, petiole length （D=0.982）, petiole thickness （D=0.995） and leaf thickness （D=0.987）. And all the characteristic values varied broadly with coefficients of variation ranging from 9.84% to 40.09%; 79 accessions were divided into 6 groups by UPGMA method, there were significant differences in leaf morphological traits among the 6 groups; Group I and group VI were quite different from other groups and parent plants （cv. ＂Dawuxing＂）. The leaves of group I were darkgreen, large, hard and thick with long and thick petioles; while those of group VI were yellowgreen, small, thin and soft with slender petioles. These two groups were important excellent germplasm. Based on the abundant genetic diversity in leaf morphological characteristics, the breeding via ＂miniature seeds＂ was considered as an efficient method for broadening the germplasm resources and breeding new varieties of loquat.展开更多
To understand the effects of leaf physiological and morphological characteristics on δ13C of alpine trees, we examined leaf δ13C value, LA, SD, LNC, LPC, LKC, Chla+b, LDMC, LMA and Narea in one-year-old needles of P...To understand the effects of leaf physiological and morphological characteristics on δ13C of alpine trees, we examined leaf δ13C value, LA, SD, LNC, LPC, LKC, Chla+b, LDMC, LMA and Narea in one-year-old needles of Picea schrenkiana var. tianschanica at ten points along an altitudinal gradient from 1420 m to 2300 m a.s.l. on the northern slopes of the Tianshan Mountains in northwest China. Our results indicated that all the leaf traits differed significantly among sampling sites along the altitudinal gradient(P<0.001). LA, SD, LPC, LKC increased linearly with increasing elevation, whereas leaf δ13C, LNC, Chla+b, LDMC, LMA and Narea varied non-linearly with changes in altitude. Stepwise multiple regression analyses showed that four controlled physiological and morphological characteristics influenced the variation of δ13C. Among these four controlled factors, LKC was the most profound physiological factor that affected δ13C values, LA was the secondary morphological factor, SD was the third morphological factor, LNC was the last physiological factor. This suggested that leaf δ13C was directly controlled by physiological and morphological adjustments with changing environmental conditions due to the elevation.展开更多
文摘The genetic diversity of 79 accessions regenerated from ＂miniature seeds＂ of loquat （Eriobotrya japonica Lindl. cv. ＇Dawuxing＇） was analyzed based on 13 morphological characteristics of leaves in this study, in order to provide important morphological basis for breeding new varieties and materials through ＂miniature seed＂ breeding method in loquat. The results showed that there was abundant genetic diversity in leaf morphological characteristics of regenerated plants （D=0.785）, especially indicated by diversity indexes of leaf length （D=0.991）, leaf width （D=0.994）, petiole length （D=0.982）, petiole thickness （D=0.995） and leaf thickness （D=0.987）. And all the characteristic values varied broadly with coefficients of variation ranging from 9.84% to 40.09%; 79 accessions were divided into 6 groups by UPGMA method, there were significant differences in leaf morphological traits among the 6 groups; Group I and group VI were quite different from other groups and parent plants （cv. ＂Dawuxing＂）. The leaves of group I were darkgreen, large, hard and thick with long and thick petioles; while those of group VI were yellowgreen, small, thin and soft with slender petioles. These two groups were important excellent germplasm. Based on the abundant genetic diversity in leaf morphological characteristics, the breeding via ＂miniature seeds＂ was considered as an efficient method for broadening the germplasm resources and breeding new varieties of loquat.
基金supported by the Major Research Plan of the National Natural Science Foundation of China (Grant No. Y411381001)the National Natural Science Foundation of China (Grant No. 91125025)the Postdoctoral Science Foundation of China (Grant No. 2013M532096)
文摘To understand the effects of leaf physiological and morphological characteristics on δ13C of alpine trees, we examined leaf δ13C value, LA, SD, LNC, LPC, LKC, Chla+b, LDMC, LMA and Narea in one-year-old needles of Picea schrenkiana var. tianschanica at ten points along an altitudinal gradient from 1420 m to 2300 m a.s.l. on the northern slopes of the Tianshan Mountains in northwest China. Our results indicated that all the leaf traits differed significantly among sampling sites along the altitudinal gradient(P<0.001). LA, SD, LPC, LKC increased linearly with increasing elevation, whereas leaf δ13C, LNC, Chla+b, LDMC, LMA and Narea varied non-linearly with changes in altitude. Stepwise multiple regression analyses showed that four controlled physiological and morphological characteristics influenced the variation of δ13C. Among these four controlled factors, LKC was the most profound physiological factor that affected δ13C values, LA was the secondary morphological factor, SD was the third morphological factor, LNC was the last physiological factor. This suggested that leaf δ13C was directly controlled by physiological and morphological adjustments with changing environmental conditions due to the elevation.
