Floral organ growth and carbohydrate content during pollen development in Lilium

被引:109
作者
Clement, C
Burrus, M
Audran, JC
机构
[1] Univ. de Reims Champagne-Ardenne, Lab. de Biol. et Physiol. Veg., UFR Sciences, 51687 Reims Cédex2
关键词
anther; carbohydrate content; floral organ growth; floral sugar physiology; Lilium; pollen development;
D O I
10.2307/2446215
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
In order to understand floral sugar physiology, we correlated the growth of the organs with carbohydrate content in the flower of Lilium cv. ''enchantment'' during pollen development. In a previous work, we distinguished two phases in pollen ontogenesis: the anther growth phase, from the microspore mother cell until the vacuolated microspore, and the anther maturation phase, from the vacuolated microspore until anthesis. In the present work, we showed that during the growth phase, the anther underwent most of its size and dry weight growth, whereas the growth rate of nonanther organs was reduced. Anther and filament possessed the highest amounts of carbohydrates, which decreased progressively until the vacuolated microspore stage. During the maturation phase, sucrose and starch increased in all floral organs. Anther growth was completed at the Mi stage, whereas the nonanther organs began exponential growth. From these observations, we concluded that hierarchic nutritional correlations exist between the flower organs, in which the anther is the main actor: during the anther growth phase, the anther represents the highest sink strength floral organ, and mainly attracts assimilates through the filament. During the anther maturation phase, anther growth is achieved, its needs decrease, and assimilates are thus available for neighboring organs, which undergo intense growth until anthesis.
引用
收藏
页码:459 / 469
页数:11
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