Studies on anthesis and flowering pattern in mUlberry germplasm

Abstract

Mulberry (Morus sp.) dioecious (male) and monoecious germplasm accessions of different geographical origin showed anthesis period between January and April. Indigenous and exotic accessions of Asian countries flowered during January to February except few accessions from Japan, China, Burma and Turkey which flowered during March and April months, while rest flowered during March to April. The number of catkins per axis was more in exotic accessions with small size and less number of florets compared to indigenous one. Dehiscence of anther was highest during 10.00-11.30 AM and 3.00-4.00 PM in the day time, while the event occurred throughout the day and was restricted to 1-4 days (Indigenous 1- 3; Exotic 2-4 days) for a single catkin. The size of the pollen showed variation with two germpores irrespective of its origin, except in few cases where the germpores were 3-4. In vitro germination of pollen showed significant variation and did not relate with the origin of the accessions but declined with the increase of storage time.