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Pollen viability, germination, and seed setting of Nelumboÿnucifera

AkhomÿKhatfan^a, ZuoÿLi^b, Long-QingÿChen^c, NopadolÿRiablershirun^a, VithayaÿSathornviriyapong^d, NiranÿJuntawong^a,e,*

 
ABSTRACT:     In tropical countries, low seed setting is a major problem when cultivating lotus (Nelumbo nucifera Gaertn.). This study determined seed setting in six wild lotus cultivars: Sai Rung (SR), Sam Roi Yot (SY), Klong Yong, Puttha Monthon (PM), Rachine (RC), and Nakhon Sawan (NW). In nature, the seed-setting rates range from 52–78%. From a stigma removal study, only a 53% seed-setting rate by self-pollination was recorded in the SR cultivar. This result was similar to the seed setting of self-pollinated PM, although high viability of PM pollen from dayÿ2 full bloom flowers was observed. Self-incompatibility was studied in RC and NW cultivars. The indices of self-incompatibility of RC and NW were both 96% indicating that self-incompatibly affects low seed setting in these two cultivars. The results showed that the low seed-setting rate also came from seed abortion. A high value of self-incompatibility was observed in RC and NW cultivars, but not in the other cultivars studied.

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* Corresponding author, E-mail: fscinrj@ku.ac.th

Received 10 Jul 2013, Accepted 12 Nov 2014