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Flower phenotypic variations of germplasm resources of Siberian apricot(Armeniaca sibirica)

YIN Mingyu;ZHU Xuchun;LIU Huimin;LIU Jiangqun;WUYUN Tana;Non-Timber Forest Research and Development Center,Chinese Academy of Forestry;  
【Objective】This study was conducted to determine the variations and relationships in floral phenotypic traits,pollen and pistil development of Armeniaca sibiricain Nei Mongol.【Method】A total of 256 individuals from 13 A.sibirica provenances were selected and the floral quantitative traits(flower length,corolla diameter,petal length,petal width,stamen numbers,stamen length,c,pollen quantity and pollen viability),quantitative traits(petal color,calyx color,petal shape,petal smoothness and petal type)and pistil development degrees were surveyed.Then,the variations of quantitative traits,the correlations between floral phenotypic traits and pollen characteristics and between pistil development degree and fruit setting rate were analyzed.【Result】There were significant variations in floral quantitative traits.The average variation coefficient of quantitative traits was 19.77%,with the highest in pollen quantity(41.41%)and lowest in number of stamens(10.26%).The flower length,corolla diameter,petal length,petal width,stamen length,pistil length,quantity and viability of pollen obeyed the normal distribution,while the stamen numbers did not.The quantity of pollen ranged from 12 290.00 to 40 101.00 for 78.57% resources with 42.86% having pollen viability of higher than 50%.The rate of pistil abortion of A.sibirica was very low,but with great increasing potential.86.4% of resources had complete flower rate of higher than 50%,and the fruit setting rate generally increased at the first and then decreased with the increase of complete flower percentage.There were significant positive correlations among complete flower rate with flower length,corolla diameter,petal length,petal width and pistil length.The complete flower rates were in the order of middlesoutheastwestnorth spatially,and in the order of middleupperlower vertically.The main descriptive characters of A.sibirica were:white or light pink petals,round or ovoid petals,reddish brown or purplish red calyxes,very few green calyxes,flat petals smoothness,single flower,and few double flower.【Conclusion】There were high variation degree and rich diversity in floral quantitative traits of A.sibirica.
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