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Acta Horticulturae Sinica ›› 2021, Vol. 48 ›› Issue (5): 1002-1012.doi: 10.16420/j.issn.0513-353x.2020-0809

• Research Papers • Previous Articles     Next Articles

Studies on Flowering Characteristics and Breeding System of Paphiopedilum dianthum

YANG Jiahui1, WU Ting2, ZHU Jun1, YANG Shuhua2, ZHAO Xin2, GE Hong2, WU Ronghua1,*(), JIA Ruidong2,*()   

  1. 1College of Forestry,Henan Agricultural University,Zhengzhou 450002,China
    2Institute of Vegetables and Flowers,Chinese Academy of Agricultural Sciences,Beijing 100081,China
  • Received:2020-11-09 Revised:2021-04-10 Online:2021-05-25 Published:2021-06-07
  • Contact: WU Ronghua,JIA Ruidong E-mail:Wuronghua06@126.com;jiaruidong@caas.cn

Abstract:

The floral characteristics and flowering process ofPaphiopedilum dianthum under greenhouse cultivation condition were investigated. Meanwhile,the pollen viability and stigma acceptability determination,hybridization index estimation,and artificial controlled pollination test were conducted to analyze floral characteristics and breeding system of the P. dianthum. The results showed that P. dianthum blossomed from June to September,with a single flowering period of 45 to 55 d,a single plant flowering period of 75 to 90 d. Each plant generally produced one peduncle bearing with two to five flowers. During the entire blooming process,the pollinia formed by anthers were persistently located on both sides of the staminode and the relative positions remained unchanged. The pollen viability and stigma receptivity reached the highest in the full-flowering period(flowering 6 to 34 d),and the pollen and sitgma have a longer life span. The hybridization index(OCI)ofP. dianthum was four. Regardless of emasculation or not,the seed setting rates of artificial self-pollination,artificial cross-pollination of the same plant,and artificial cross-pollination of different plants were 83.30%,90.00%,and 96.70%,respectively. No significant difference was observed among these rates,which were all significantly higher than that of natural pollination. These results demonstrate that there is no apomixis but highly passive self-crossing and out-crossing abilities in the P. dianthum,and the breeding system is a mixed mating system of selfing and out-crossing that requires pollinators.

Key words: Paphiopedilum dianthum, flower, pollen viability, stigma, receptivity, hybridization index, breeding system

CLC Number: