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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (10): 42-48.doi: 10.11707/j.1001-7488.20141006

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Biological Characteristics of Flowering and Pollination in Castanea henryi

Fan Xiaoming1, Yuan Deyi1, Tang Jing1, Tian Xiaoming2, Zhang Xuhui1, Wang Bifang1, Tan Xiaofeng1   

  1. 1. Key Laboratory of Non-Wood Forest Product of State Forestry Administration Key Laboratory of Cultivation and Protection for Non-Wood Forest Trees of Ministry of Education Central South University of Forestry and Technology Changsha 410004;
    2. Hunan Forest Botanical Garden Changsha 410116
  • Received:2013-10-11 Revised:2014-09-01 Online:2014-10-25 Published:2014-11-12

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Abstract:

A field investigation, and erperiments of pollen germination in vitro, paraffin sectioning and artificial pollination were conducted to study flowering dynamics, pollen viability, stigma receptivity, characteristics of wind pollination and pollen germination of Castanea henry. The results showed that the differentiation time of female flowers in C. henryi was about 40 days, and the differentiation time of a single flower was about 22 days. The stigma receptivity duration was 7 days. The male inflorescence bloomed from April to May, and spanned about 23 - 26 days. The life span of individual male inflorescence was approximately 10 - 12 days. Within 6 days after flowering, the inflorescence maintained the highest pollen viability. Anemophily was the main pollination process of C. henryi, and wind speed and direction were the main meteorological factors affecting the pollination. With emasculation bagging, and without artificial pollination, C. henryi had not fruit. This result indicated that C. henryi did not occur apomixis. The artificial pollination experiment showed that outcrossing could significantly increase the fruiting rate of C. henryi, thus the pollination tree should be configured in the field.

Key words: Castanea henryi, flowering dynamics, stigma receptivity, anemophily

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