Effects of gibberellic acid (GA3) on dormancy termination, sprouting and quality of potato ( Solanum tuberosum L.) seed tubers stored for 12 weeks in Diffused Light Store (DLS) and for 2 weeks in pit were determined. Potato genotypes (Tigoni, Asante, Dutch Robyjn, Kenya Karibu and Kenya Sifa) and GA3 at 0, 10, 20 and 30 mg kg-1 were used. Dormancy period was reduced to three weeks in all genotypes except Kenya Sifa, which sprouted after seven weeks following GA3 treatments in DLS. Increasing GA3 concentrations increased sprouting (%), number of sprouts per tuber, sprout length and vigor score. However differences among GA3 concentrations for these parameters were not observed. In the pit, the potato seed tubers sprouted within the two weeks of storage. Except for Kenya Sifa, GA3 had no effect on sprouting and vigor score; however, it increased number of sprouts per tuber and sprout length. Increase in GA3 concentration led to increase in rotting at 30 mg kg-1 of GA3 for Tigoni, Kenya Sifa and Kenya Karibu genotypes, under DLS. It is suggested that lower levels of GA3 of up to 20 mg kg-1 should be adopted for promotion of sprouting of potato seed tubers.
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[Show abstract][Hide abstract] ABSTRACT: The aim of the present investigation is to identify a suitable and cost efficient substitute of Gibberellic acid to enhance hybrid rice seed production. The experimental material comprising both the parental lines of hybrid NDHR2 i.e. IR58025A and NDR3026-3-1R were treated with 34 treatment combination of different growth regulators and one untreated check were grown in randomized block design with three replications. The results indicated that the analysis of variance was significant for all the characters except plant height and effective tillers per plant. The exogenous application of various plant growth hormones significantly increases seed yield with a range of 14.85 g to 23.54 g. The treatment T26 i.e. GA3 (45 g) + C.C had highest significant increase in yield followed by T2 (GA3 45 g), T1 (GA3 30 g), T5 (NAA 200 g), T3 (NAA 100 g), T27 (Urea 2 g + C.C.) and T24 (GA3 45 g + K2PO4 2 g). Remarkable increase in other growth and yield components was also observed with the foliar application of various plant growth regulators. It is concluded that treatment combination T26 (GA3 45 g+ Urea 10g + Boric acid 2g + ZnSO4 + K2 PO4 2g) gave best results and could be used to enhance hybrid rice seed production and substitute of GA3 in India as well as other hybrid rice growing countries.
Full-text · Article · Feb 2011 · Asian Journal of Plant Sciences