to achieve greater yield potential, higher grain filling with better sink source balance, dry mater remobilization and transport of soluble sugars to panicle is essential. Harvest index indicate above mentioned characters properly. Thus, variations of harvest index of F2 population obtained from cross of highest and lowest harvest index will study for their sink source relations and related traits.
- Expression of harvest index and sink source variations :
Ability of limited drying on increasing harvest index will be tested and recognize the mechanisms related to yield changes under limited drying at grain filing stage.
- Effect of limited drying at grain filling stage and micro climatic variations on harvest index :
To increase the yield potential, the effects of the nitrogen level and planting density on leaf photosynthetic characteristics and leaf area development should be examined.
- Effect of Nitrogen level and planting density on dry matter remobilization of rice :
Increase of yield potential needs large source capacity to fill the superior grains in large panicle varieties. But NIV’s which are having semi dwarf gene limits the source capacity. This research aims to improve plant height while increasing culm strength to achieve large source capacity for large panicle varieties.
- Modification of plant architecture for break through yield potential :
More than 160 accessions screened for stay green character to realize the pattern of chlorophyll degradation. Selected accessions will further study to realize the adaptation mechanisms.
- Physiological adaptation mechanisms to maintaining stay green character under irrigated conditions :