Standardization of priming treatments for enhancement of seed germination and field emergence in carrot
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Daucus carota, field emergence, germination, osmopriming, solid matrix priming.Issue
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Abstract
Carrot (Daucus carota L.) seeds were subjected to solid matrix priming with moist vermiculite at 15°C and 20°C for 12, 24, 36 and 48 h. Seeds were also osmoprimed at -0.5, -1.0 and -1.5 MPa potential for 2, 4 and 6 days. Solid matrix priming for 24 h registered significantly higher seed germination (85%) and speed of germination (14.45), while priming duration of 48 h gave minimum value for speed of germination. However, no significant differences in speed of germination were found at different temperatures. Solid matrix priming for 24 h at 20°C was optimum for obtaining maximum speed of germination (14.67) and vigour index I (821.5). With increase in priming duration from 2 to 6 days, there was significant decrease in germination. Osmopriming at -1.0 MPa PEG potential significantly improved speed of germination (7.07) and was at par to PEG priming at -0.5 MPa. Osmopriming for 2 days at -1.0 MPa PEG potential recorded maximum speed of germination (9.24) over all other treatment combinations. Osmopriming at -1.0 MPa and solid matrix priming for 24 h at 20°C improved germination and field emergence over control in carrot. Hence, osmopriming and solid matrix priming can be effectively employed for improved field performance in carrot.
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