Effect of plant growth regulators on growth, flowering and corm production of gladiolus cv. Snow Princess

P Naveen Kumar; R L Misra

doi:10.56093/ijas.v82i7.21690

Authors

P Naveen Kumar Directorate of Floricultural Research, Pusa, New Delhi 110 012
R L Misra Directorate of Floricultural Research, Pusa, New Delhi 110 012

https://doi.org/10.56093/ijas.v82i7.21690

Keywords:

Benzyl Adenine, Corm, Cormel, Flowering, Gibberellic acid, Gladiolus, Indole acetic acid, Soaking, Spraying

Abstract

The earliness in sprouting was observed with all the treatments of IAA and GA₃ irrespective of the concentrations, however, the earliest (10.00 days) was recorded in corms dipped in GA₃ (1 000 ppm). GA₃ was found to be the best in increasing the floret diameter, number of florets/spike, rachis length and field durability of spike and in earliness to flowering. The number of cormels/plant and volume were highly increased by IAA treatment. Both IAA and GA₃ were found equally effective in increasing the weight of corm and cormels, diameter of the corm and propagation coefficient, spike length, leaf area and early sprouting of the corms. Among the different modes of application, soaking treatment helps in the efficient absorption of the growth regulator solutions and its effect on sprouting and early vegetative growth is pronounced whereas spraying influences the corm characters and to some extent the flowering behaviour. Soaking + spraying treatment had lasting effect throughout the crop period and hence was superior to all other treatments.

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