Journal of Food, Agriculture and Environment

Source and sink changes of lily bulb and the transportation role of the basal plate during the development of oriental hybrid lily ‘Sorbonne’

Author(s):

Sha-Sha Wu, Li-Na Chen, Qi-Xiang Zhang, Ying-Min Lv *

Recieved Date: 2012-02-24, Accepted Date: 2012-04-29

Abstract:

The bulb of the genus Lilium is composed of scales, roots, shoots and a basal plate, among which the three former organs are connected through the basal plate. However, anatomy and function of the basal plate are not studied well. The anatomy, ultra-structure of the basal plate, and the localization of β-amylase in the basal plate was investigated by parafin section, transmission electron microscopy, and immunogold labeling. To investigate the function of the basal plate focusing on the source and sink relationship, 6(5)-carboxyfluorescein diacetate was applied to the proximal end of outer scales, the 5^th leaf from the bottom on the stem, and the apical 5^th leaf at different growth and development stages. The 6(5)-carboxyfluorescein (CF) observation results show that the lily bulb serves as source after planting to the flower buds reaching 1 cm length. Then the change from source to the combination of source and sink occurred before the flower buds reaching 3 cm length. Till anthesis, the dynamic changes of providing and receiving assimilates take place in the bulb. After anthesis, the bulb became the main sink to reserve photosynthates for dormancy and growth of the next growing cycle. CF transportation between scales and stem must pass through the phloem strands in the basal plate, which indicates the important transportation function of the basal plate. The presence of transverse and longitudinal sections of vascular bundles in the basal plate reveals that the basal plate has complex distribution of vascular bundles. The result that β-amylase, one of the key enzymes hydrolyzing starch, was localizing in starch grains, protein-accumulating plastids, and sieve board shows that  the function of β-amylase is probably concerned with prevention of starch accumulation rather than starch breakdown. 

Keywords:

Lilium, oriental hybrid, source and sink relationship, basal plate, CF transportation

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 2
Category: Environment
Pages: 1213-1219

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