Pattern of supply affects boron toxicity in barley

Riley, M M; Robson, A. D.

doi:10.1080/01904169409364842

Cited by 18 publications

(12 citation statements)

References 8 publications

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“…Similarly, a recent study considering a combination of presence/absence of Sahara alleles on chromosomes 2H and 4H in near-isogenic lines (NILs) of barley found no yield advantage in the tested BC families (McDonald et al 2009). Both studies concluded that the inconsistent and oscillating yield effects may be due to a complex interaction of environmental factors such as site-specific or seasonal B toxicity effects (Riley and Robson 1994), in combination with other subsoil constraints including salinity, sodicity and water scarcity (Adcock et al 2007). For barley, these results suggest that yield advantages from selection based solely on B exclusion and leaf symptom expression may be small (McDonald et al 2009, Reid 2010.…”

Section: B Tolerance In Wheatmentioning

confidence: 99%

Boron toxicity tolerance in wheat and barley: Australian perspectives

2010

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Section: B Tolerance In Wheatmentioning

confidence: 99%

Boron toxicity tolerance in wheat and barley: Australian perspectives

2010

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“…This is supported by other published data. The results of (Riley and Robson 1994) show a strong linear relationship between shoot B concentration and relative dry matter at B concentrations between 100 and 550 mg kg, but below this the relationship was weak. Previous work with durum wheat at high concentrations of soil B (100 mg/kg) found no correlation between shoot B concentration and seedling dry matter (Yau et al 1995), while Choi et al (2007) found a poor association between shoot growth and shoot B concentration among species with different levels of B tolerance.…”

Section: Discussionmentioning

confidence: 85%

“…Visual symptoms of B toxicity on barley commence with marginal chlorotic spots which progressively develop into brown necrotic lesions (Cartwright et al 1986;Riley and Robson 1994;Torun et al 2002;Yau and Ryan 2008). Initially, symptoms are most severe on the distal part of the leaf and along the margins, but eventually the whole leaf blade is affected.…”

Section: Symptoms Expressionmentioning

confidence: 98%

“…A major gene for this trait has been identified and cloned (Reid 2007;Sutton et al 2007). Despite the importance placed on B exclusion, barley may be able to accumulate high concentrations of B and express severe symptoms of B toxicity before significant reductions in dry matter production or yield occur (Riley 1987;Riley and Robson 1994). The effectiveness of B exclusion as a way to improve growth and yield in barley has yet to be critically examined under field conditions.…”

mentioning

confidence: 98%

“…While significant reduction in the growth and grain yield of wheat and barley can occur (Paull et al 1988;Nable 1991;Torun et al 2002;Yau 2002), the occurrence and severity of B toxicity is variable. There can be a high level of spatial variation in the field (Ryan et al 1998) and the timing of B toxicity during the growing season has a marked effect on grain yield (Riley and Robson 1994).…”

mentioning

confidence: 99%

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Assessment of the agronomic value of QTL on chromosomes 2H and 4H linked to tolerance to boron toxicity in barley (Hordeum vulgare L.)

2009

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Improved boron (B) tolerance has been an objective of barley breeding programs in regions where B toxicity occurs. Traits associated with B tolerance have been mapped on chromosomes 2H and 4H and it has been proposed that these be used for marker assisted selection for B tolerance. However, there has been little or no improvement in yield using this strategy. This study examined the reasons for the small yield differences among different lines of barley that differ in B tolerance. Experiments used backcross lines derived from crosses between the B-tolerant landrace Sahara 3771 and two adapted recurrent parents, Sloop and VB9104. Lines with different combinations of the Sahara 3771 alleles on chromosomes 2H and 4H were grown over three growing seasons at sites where barley is prone to B toxicity. Grain yields of the backcross lines were similar to or lower than those of the recurrent parents despite showing differences in the expression of B toxicity symptoms and in B concentration in vegetative tissue. There were few significant differences in grain yield among the backcross lines. Variation in dry matter production among the backcross lines in each of the three growing seasons was unrelated to shoot B concentrations while grain yield was correlated with shoot B concentration only among the backcross lines of VB9104 in one season. In this case the yield loss was 4% per 10 mg kg -1 increase in shoot B concentration. Variation in shoot B concentration and yield across seasons was much greater than that observed among the different barley lines. Reduced B accumulation was associated with higher shoot sodium concentration among the Sloop backcross lines. The results suggest that yield gains from selection based largely on B exclusion and symptoms expression may be small and strongly affected by site and seasonal effects. In the regions where other soil constraints, such as soil salinity and micronutrient deficiencies are also important, reducing B uptake alone may have little effect on yield if these other soil properties are also limiting yields.

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