Intraspecific variation in sensitivity to ambient ultraviolet-B radiation in growth and yield characteristics of eight soybean cultivars grown under field conditions

Abstract

The present study was conducted with eight cultivars of soybean (Glycine max) to determine the effect of exclusion of solar UV-B on the vegetative growth (plant height, leaf area, no. of nodes), UV absorbing compounds (implicated in UV protection) and crop yield (No. of pods and seed weight) and to determine the cultivar difference in their sensitivity to ambient UV-B. Exclusion of solar UV-B enhanced the vegetative growth and yield of all the soybean cultivars. The results showed a significant inverse association between the enhancement in vegetative growth and number of pods among the cultivars tested, indicating differences in the carbon partitioning amongst the cultivars by the way of exclusion of solar UV-B. NRC-7, Pusa-24 and JS-335 showed maximum promotion in vegetative growth and less enhancement in crop yield after solar UV-B exclusion. Kalitur, JS71-05, Hardee, PK-472 and PK-1029 showed improved performance both in terms of number of pods/plant and seed weight after solar UV-B exclusion. An enhancement in the crop yield by exclusion of solar UV-B indicated poor response of the cultivar to the ambient solar UV-B; these cultivars would be more suitable at latitudes, which received less UV-B. According to UV-SI, sensitivity of eight Indian soybean cultivars to ambient level of UV-B (280-320 nm) radiation had the following descending order; PK-472 > JS-335 > Hardee > Kalitur > JS71-05 > Pusa-24 > NRC-7 > PK-1029. These findings suggest the way to select the best-suited cultivar for particular latitude.

A novel mineral composition increases soybean crop yield by mitigating stress induced by ultraviolet-A and -B radiation

“…Regarding yield, the present study confirmed a previous report that UV-B causes a reduction in yield potential notably due to smaller number of pods per plant with a reduction of 25% in number of pods per plant with supplemental UV-B over ambient UV-B [15]. Conversely, in a prior study applying the exclusion of UV-B on 8 soybean cultivars, an increase in number of pods per plant of up to 43% was found [2]. In a 2-year study of the effects of UV-B on soybean yield, it was determined that yield reduction was mainly attributable to a change in number of pods per plant under UV-B radiation, which decreased the number of pods per plant of three soybean cultivars by 34.5% on average [19].…”

Regulation of growth and development in phytochrome mutants of Arabidopsis thaliana by solar UV

“…Earlier studies have shown increased number of nodes and pods in eight soybean cultivars after exclusion of UV-B (Baroniya et al 2011). Although UV-B can damage plants, it is proposed to convey photomorphogenic information (Tevini and Teramura 1989).…”

QTL Analysis of Resistance to High-Intensity UV-B Irradiation in Soybean (Glycine max [L.] Merr.)

“…is one of the most important crops for food, feed, energy production, and industrial resources worldwide. Under supplemental UV-B radiation, soybean cultivars show differences in physiological damage and morphological changes; UV-B-sensitive cultivars show significant yield reductions [6,7,8]. Quantitative trait loci (QTLs) associated with resistance to supplementary UV-B treatment have been identified on chromosomes (Chrs) 3, 6, 7, and 19 using a recombinant inbred line (RIL) population derived from a cross between Keunol (UV-B sensitive) and Iksan10 (UV-B resistant) [9].…”