Effects of source and sink removal on yield attributes and yield of mungbean [Vigna radiata(L.) Wilczek]

Abstract

Field experiments were conducted to investigate the effect of source (leaf) and sink (flower and pod) removal on some morphological characters, and yield and its attributes in high and low yielding mungbean genotypes grown under sub-tropical condition. Four levels of defoliation (0, 8, 16 and 33%), four levels of deflowering (no deflowering, deflowering of all opened flowers borne up to 10th or 15th or 20th nodes in a raceme), and four levels of depodding (no depodding, depodding of all pods for 5 or 10 or 15 days after anthesis) were employed. The results showed that defoliation had no significant effect on seed yield in high yielding genotype, while it reduced the yield in low yielding one under 16 and 33% defoliation. Deflowering up to 10th nodes had no significant effect on seed yield though deflowering beyond 10th nodes in a raceme reduced the seed yield in high yielding mungbean genotype; low yielding genotype exhibited reduced seed yield under any level of deflowering. Depodding up to five days from anthesis had no negative effect on seed yield though depodding beyond this period reduced the yield depending upon the magnitude of depodding. Pod number per plant, number of seeds per pod and 1000-seed weight were the yield attributes sensitive to deflowering and depodding. The results suggest that mungbean plant, especially high yielding genotypes, can compensate seed yield to moderate source loss and partial sink loss.

Effect of Source Removal at Reproductive Stage on Yield and Yield Component Traits in Greengram (Vigna radiata L. Wilczek)

“…This also indicated that high yielding genotypes has higher compensatory mechanism to source (leaf) loss than low yielding ones. Similar statement about compensatory mechanism of low and high yielding genotypes has earlier been reported [7][8] also stated that 25 per cent defoliation not affects the significant yield loss but slightly enhance the yield in mungbean. The higher leaf compensation capacity in high yielding genotype could be due to higher number of newly emerged leaves and their high phososythetic activity after defoliation may accumulate more sink resulting higher yield up to threshold level.…”

How Does Storing Containers on Farmers Stored Boro Rice Seed Affect the Seed Qualities?

“…In Bogra the moisture content of farmers saved seeds ranged from 12.30 to 14.40% [20]. The moisture content of farmers' seeds collected from Rajshahi, Bogra and Rangupur reported ranged from 7.0 to 13.9% that varying with respect to crop season farmers and location of seed collection, But in 2003 they reported that the moisture content of farmers' rice of the same locations ranged from 12.87% to 13.30% [12]. It indicates that moisture content may vary from farmers to farmers as well as location to location.…”

“…Another study shown that the moisture content and black point infection increased, the seed germination decreased with the increase of storage period [13]. Reported that number of insect damage seeds, insect population and fungi infection varied with respect to storage containers, storage period and additives used [3,12]. It was showed that gunny bag is the worst compare to metal structures as storage containers for ensuring quality of seeds [13] and also reported that highest germination and lowest prevalence of fungi were recorded in the seeds stored in tin followed by polythene bag and gunny bag with polythene lining [20].…”