IMPACT OF ASSIMILATE AVAILABILITY AND ITS UTILIZATION ON SEED BIOMASS IN KABULI CHICKPEA
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Date
2013
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Abstract
The present investigation was carried out in kabuli chickpea cultivars differing in seed size consisting of two small (BG-1053 and L-550), two medium (GLK-25104 and GLK-28125) and two bold (GLK-27346 and GLK-26155) seeded cultivars. The variations in physiological parameters (biomass accumation, plant height and number of branches) and in activities of enzymes of sucrose metabolism such as invertases (acid and alkaline) and sucrose synthase were estimated in the vegetative (apical leaves, 1st to 3rd intermodal portion of the stem) and reproductive tissues (podwall and seeds) of these cultivars at different stages of crop development. The profound vegetative growth in bold seeded cultivars was the result of their increased height and broader leaves that might be assimilating more photosynthates in them as compared to small seeded cultivars. The higher activities of sucrose metabolizing enzymes in leaves and stem along with higher content of total sugars in these tissues of bold seeded cultivars were might be responsible better availability and utilization of these photoassimilates for increased vegetative growth in them as compared to small seeded cultivars. The lower as well as earlier decrease in activities of invertases and sucrose synthase in podwall of GLK-27346 and GLK-26155 as compared to medium and small seeded cultivars might be helping to channel more sucrose towards the seeds. The rapid decrease in invertase activities in seeds of GLK-27346 and GLK-26155 at 21 days after flowering and higher and sustained activity of sucrose synthase in their seeds upto 35 days after flowering as compared to other culivars indicates longer seed filling duration and higher sink strength in them that might be responsible for their increased seed size.
Chickpea, Leaves, Stem, Pod wall, Seed, Seed size
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