Physiological constraints to productivity in Indian mustard (B. juncea L. Czern & Coss.)
Poor harvest index of rapeseed and mustard crop is one of the physiological constraint to productivity. The present paper focuses on the causes of poor partitioning of assimilates. Yield per se is complex character governed by many physiological attributes, viz: rate of photosynthesis, rate & magnitude of translocation from source to sink and the sink strength. Photosynthetic rate of leaves ofB. juncea, B. napus, and B. campestris was nearly equal, but higher than that of B. tournifortii. The photosynthetic rate of different species was in the decreasing order;, B. tournifortii, B. napus, B. campestris, B. juncea. Species B. tournifortii though has maximum photosynthetic rate is very poor seed yielder. Photosynthetic rate of the leaves as well as the flower buds was higher in B. napus, but it is poor yielder in most of Indian climatic conditions. Photosynthetic rate at 30 days after sowing stage was in the order: Upper leaves, lower leaves and middle leaves. At 60 days, it was lesser than at 30 DAS stage. Plucking lower half leaves at 40 to 70 days after sowing showed a significant increase in seed yield. When lower, middle, or upper leaf was fed with 14CO2, the maximum incorporation of radioactive 14C was from middle leaves. Comprehensive studies on B. juncea suggest that: compared to existing sink size, the source size is surplus. To divert translocation of assimilates from vegetative sinks (roots and lower leaves) to the siliquae; the magnitude of translocation needs to be improved through increase in sink strength.
Rapeseed and Mustard Productivity Assimilate Partitioning Source: Sink relationship Brassica
M.L.Chhabra B.K.Sinha Dhiraj Singh Kamai Dhawan Rajesh Sharma
Department of Plant Breeding (Oilseeds section), Chaudhary Charan Singh, Haryana Agricultural University, Hisar-125 004 (India)
国际会议
第十二届国际油菜大会( The 12th International Rapeseed Congress)
武汉
英文
1092-1095
2007-03-26（万方平台首次上网日期，不代表论文的发表时间）