Effect of pattern and severity of moisture-deficit stress on stalk-rot incidence in sorghum. II. Effect of source/sink relationships

Seetharama, N.; Sachan, Richa; Huda, Abul Kalam Samsul; Gill, K. S.; Rao, K. Narayana; Bidinger, F. R.; Reddy, D. Mallikarjuna

doi:10.1016/0378-4290(91)90011-j

Cited by 8 publications

(6 citation statements)

References 6 publications

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“…We reveal, furthermore, a new effect of a So-Si ratio change on the fruit quality potential: when the sink is decreased by removal of many hands, the fruit susceptibility to crown rot decreases. Few studies on various plants have linked the importance of So-Si ratio, and thus photosynthetic assimilate distribution, in plant-pathogen interactions (Dood, 1980;Barrière et al, 1981;Barrière, 1985;Pegg, 1986;Seetharama et al, 1991). However, in the case of bananas, the present results contrast with the previously reported observation that modifying the So-Si ratio has no effect on fruit susceptibility to anthracnose or on the fruit conservation potential (Chillet et al, 2006).…”

Section: Discussioncontrasting

confidence: 57%

Hand position on the bunch and source–sink ratio influence the banana fruit susceptibility to crown rot disease

Lassois

Bastiaanse

Chillet

et al. 2010

Annals of Applied Biology

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Keywords AbstractThe postharvest development of crown rot of bananas depends notably on the fruit susceptibility to this disease at harvest. It has been shown that fruit susceptibility to crown rot is variable and it was suggested that this depends on environmental preharvest factors. However, little is known about the preharvest factors influencing this susceptibility. The aim of this work was to evaluate the extent to which fruit filling characteristics during growth and the fruit development stage influence the banana susceptibility to crown rot. This involved evaluating the influence of (a) the fruit position at different levels of the banana bunch (hands) and (b) changing the source-sink ratio (So-Si ratio), on the fruit susceptibility to crown rot. The fruit susceptibility was determined by measuring the internal necrotic surface (INS) after artificial inoculation of Colletotrichum musae. A linear correlation (r = −0.95) was found between the hand position on the bunch and the INS. The So-Si ratio was found to influence the pomological characteristics of the fruits and their susceptibility to crown rot. Fruits of bunches from which six hands were removed (two hands remaining on the bunch) proved to be significantly less susceptible to crown rot (INS = 138.3 mm 2 ) than those from bunches with eight hands (INS = 237.9 mm 2 ). The banana susceptibility to crown rot is thus likely to be influenced by the fruit development stage and filling characteristics. The present results highlight the importance of standardising hand sampling on a bunch when testing fruit susceptibility to crown rot. They also show that hand removal in the field has advantages in the context of integrated pest management, making it possible to reduce fruit susceptibility to crown rot while increasing fruit size.

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Section: Discussioncontrasting

confidence: 57%

Hand position on the bunch and source–sink ratio influence the banana fruit susceptibility to crown rot disease

Lassois

Bastiaanse

Chillet

et al. 2010

Annals of Applied Biology

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“…The average lesion length for hybrids was generally higher than for parental lines (Table 2). This is consistent with reports that severity of stalk rot infection is often higher among high‐yielding hybrids than among inbred lines (Seetharama et al, 1991). These differences probably result from increased sink demand on stalk carbohydrate reserves during grain development.…”

Section: Discussionmentioning

confidence: 99%

“…SC33, SC35, and SC599 have been reported to be staygreen genotypes, a trait thought to be associated with drought tolerance and stalk rot resistance (Bramel‐Cox et al, 1988; Tenkouano et al, 1993; Tao et al, 2000). Staygreen lines maintain a greater proportion of assimilates in their stems at maturity (Seetharama et al, 1991). Bramel‐Cox et al (1988) reported that a staygreen line derived from SC33 was highly resistant to M. phaseolina In a study by Tenkouano et al (1993), the staygreen genotypes B35, a close relative of SC35, SC599, and their hybrids showed high levels of resistance to M. phaseolina It was originally hypothesized that the staygreen trait might provide protection to an array of stalk rot pathogens in sorghum; however, these studies indicate that only SC599 expresses high levels of resistance to F. proliferatum This suggests that resistance to F. proliferatum and M. phaseolina may be regulated by different genes.…”

Section: Discussionmentioning

confidence: 99%

Estimation of Combining Ability for Resistance to Fusarium Stalk Rot in Grain Sorghum

2004

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Fusarium stalk rot (caused by Fusarium spp.) is an important disease of grain sorghum [Sorghum bicolor (L.) Moench]. The objectives of this study were to identify genetic sources of Fusarium stalk rot resistance and estimate combining ability. Six sorghum R‐lines, representing commercial parent lines and potential sources of stalk rot resistance, Tx2737, Tx435, SC33, SC35, SC599 and SC1158, and three standard seed parents, ASA3042, AWheatland, and ARedlan, were intercrossed in a Design II mating scheme. The inbred parent lines and corresponding hybrids were evaluated in field trials at Manhattan and Hesston, KS, in 1999 and 2000. Three randomly selected plants in each plot were artificially inoculated in the pith tissue of the basal stalk with liquid cultures of F proliferatum at 14 d after flowering. One additional plant in each plot was inoculated with distilled water as a control. At 28 d after inoculation, plants were harvested and scored for disease severity. Significant differences in disease reactions were noted among parent lines and hybrids. Among hybrids, significant male and female parent effects and interactions were detected. SC599 consistently had very low mean disease scores, followed by SC1158. Hybrids produced with SC599 were also highly resistant, indicating that genes for resistance had a dominant mode of inheritance in this genotype. SC599 represents an excellent source of resistance to F. proliferatum for use in breeding programs.

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“…is more severe when drought and high temperature stress occurs during grain development followed by wet, cool conditions near physiological maturity (Tesso et al 2012 ). Several studies have been conducted to understand the influence of drought stress (Diourte et al 1995 ; Seetharama et al 1991 ; Tenkouano et al 1993 ), nitrogen and plant growth (Cloud and Rupe 1994 ) and inheritance of resistance to Fusarium spp. and M. phaseolina .…”

Section: Introductionmentioning

confidence: 99%

“…and M. phaseolina . Seetharama et al ( 1991 ) reported high incidence of charcoal rot and low grain yield in drought stressed sorghum plants. However, there was little attempt to identify genotypes in exotic germplasm collections that might serve as potential resistance sources to Fusarium stalk and charcoal rot for breeding programs.…”

Section: Introductionmentioning

confidence: 99%

Genotypic variation in sorghum [Sorghum bicolor (L.) Moench] exotic germplasm collections for drought and disease tolerance

et al. 2013

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Sorghum [Sorghum bicolor (L.) Moench] grain yield is severely affected by abiotic and biotic stresses during post-flowering stages, which has been aggravated by climate change. New parental lines having genes for various biotic and abiotic stress tolerances have the potential to mitigate this negative effect. Field studies were conducted under irrigated and dryland conditions with 128 exotic germplasm and 12 adapted lines to evaluate and identify potential sources for post-flowering drought tolerance and stalk and charcoal rot tolerances. The various physiological and disease related traits were recorded under irrigated and dryland conditions. Under dryland conditions, chlorophyll content (SPAD), grain yield and HI were decreased by 9, 44 and 16%, respectively, compared to irrigated conditions. Genotype RTx7000 and PI475432 had higher leaf temperature and grain yield, however, genotype PI570895 had lower leaf temperature and higher grain yield under dryland conditions. Increased grain yield and optimum leaf temperature was observed in PI510898, IS1212 and PI533946 compared to BTx642 (B35). However, IS14290, IS12945 and IS1219 had decreased grain yield and optimum leaf temperature under dryland conditions. Under irrigated conditions, stalk and charcoal rot disease severity was higher than under dryland conditions. Genotypes IS30562 and 1790E R had tolerance to both stalk rot and charcoal rot respectively and IS12706 was the most susceptible to both diseases. PI510898 showed combined tolerance to drought and Fusarium stalk rot under dryland conditions. The genotypes identified in this study are potential sources of drought and disease tolerance and will be used to develop better adaptable parental lines followed by high yielding hybrids.Electronic supplementary materialThe online version of this article (doi:10.1186/2193-1801-2-650) contains supplementary material, which is available to authorized users.

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Effect of pattern and severity of moisture-deficit stress on stalk-rot incidence in sorghum. II. Effect of source/sink relationships

Cited by 8 publications

References 6 publications

Hand position on the bunch and source–sink ratio influence the banana fruit susceptibility to crown rot disease

Hand position on the bunch and source–sink ratio influence the banana fruit susceptibility to crown rot disease

Estimation of Combining Ability for Resistance to Fusarium Stalk Rot in Grain Sorghum

Genotypic variation in sorghum [Sorghum bicolor (L.) Moench] exotic germplasm collections for drought and disease tolerance

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