Journal of Food, Agriculture and Environment

Deflowering effect on morpho-physiological features and yield in mungbean 

Author(s):

M. M. A. Mondal ^{1, 2}*, M. S. A. Fakir ³, A. B. Puteh ¹, M. A. Malek ^{4, 5}

Recieved Date: 2013-01-10, Accepted Date: 2013-04-28

Abstract:

Low productivity of mungbean [Vigna radiate (L.) Wilczek] is common in subtropics, where most of the flowers are dropped and many flowers and developing pods are damaged by pests. Field experiments were performed under sub-tropical condition (24°8´N 90°0´E) to investigate the effect of seven levels of deflowering durations (0, 5, 10, 15, 20, 25 and 30 days after commencement of flowering) on morpho-physiological features and yield attributes in two high and two low yielding mungbean genotypes during Kharif-I (February-May) season, 2008 and 2009. Results showed increasing levels of deflowering parallely increased branch, leaf and dry matter (DM) production, irrespective of seasons and genotypes. In deflowered plants, DM production was increased yet seed yield was decreased with increasing level of flower removal. Decreased yield attended with fewer pods plant^-1 and seeds pod^-1, and reduced pod and seed sizes. Although number of racemes was increased following flower removal but total flower production was decreased due to reduced flowering duration and ultimately resulting in poor pod and seed yields. However, TDM and seed yield plant^-1 remained unaffected when deflowered for 10 consecutive days, constitute about 80% of total flower loss. Exceeding this threshold limit (deflowering > 10 days) seed yield was significantly reduced. Furthermore, the compensatory mechanism of sink loss was greater in the low yielding genotypes than in the high yielders, and the final yield remained smaller in the low yielding genotypes than in the high yielding ones due to fewer flower and pod production plant^-1 in the former than in the latter. Implication of the results in relation to pest and disease control is also discussed. 

Keywords:

Vigna radiate, deflowering, canopy structure, dry matter, seed yield

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 2
Category: Agriculture
Pages: 557-562

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