Micronutrients

Riley, M M

doi:10.1080/01904168709363761

Cited by 22 publications

(7 citation statements)

References 5 publications

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“…Severe toxicity and deficiency symptoms were observed on lower leaves and growing points, respectively from 16 DAS onward. Similar findings of deficiency or toxicity symptoms were reported in soybean, barley, and faba bean at a boron level below or above the optimum level in the growth medium (Hodgkiss et al 1942;Miller and Smith 1977;Riley 1987;Poulain and Mohammad 1995).…”

Section: Discussionsupporting

confidence: 71%

“…The data at 20 DAS (Table I) revealed that the optimum B concentration in the nutrient solution was 0.4 mg B L -I for young soybean plants. Riley (1987) also reported that the addition of boron to the soil or growth medium over the optimum level led to the development of symptoms of B toxicity in the barley plants and to a decreased in the growth of shoots, roots, and yield.…”

Section: Discussionmentioning

confidence: 99%

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Adequate range of boron nutrition is more restricted for root nodule development than for plant growth in young soybean plant

Rahman

Arima

Watanabe

et al. 1999

Soil Science and Plant Nutrition

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Section: Discussionsupporting

confidence: 71%

Section: Discussionmentioning

confidence: 99%

Adequate range of boron nutrition is more restricted for root nodule development than for plant growth in young soybean plant

Rahman

Arima

Watanabe

et al. 1999

Soil Science and Plant Nutrition

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“…As noted previously, this phenomenon could very likely confound attempts to use foliar analysis to diagnose B toxici- ty, especially as in the present experiments, before and after rainfall the B concentrations span the range of some published critical values for B toxicity in cereals (Davis et al, 1978;Kluge and Podlesak, 1985;Riley 1987). Thus depending upon when foliar samples were collected, different conclusions could be reached concerning the extent to which high soil B concentrations caused B toxicity and depressed yield.…”

Section: Resultsmentioning

confidence: 53%

Effects of rainfall on the use of foliar analysis for diagnosing boron toxicity in field-grown wheat

Nable

Moody

1992

Plant Soil

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The effect of rain on foliage elemental composition, especially B, was assessed using samples of wheat collected at three harvests from a field trial conducted in soil containing excessive levels of B. Moderate rainfall substantially decreased both the B concentration and content of whole shoots and young leaves. The change in B concentration due to rain suggests that foliar analysis is unreliable for diagnosing B toxicity. For the other elements examined (Ca, Cu, Mg, Mn, Mg, P, S, Zn), rainfall had little effect.

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“…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%

“…High B reduces root growth and causes marginal leaf chlorosis and necrosis (Riley 1987;Marschner 1995;Jefferies et al 1999;2000). Under severe conditions of B toxicity, much of the green leaf area can be lost.…”

mentioning

confidence: 99%

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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Micronutrients

Cited by 22 publications

References 5 publications

Adequate range of boron nutrition is more restricted for root nodule development than for plant growth in young soybean plant

Adequate range of boron nutrition is more restricted for root nodule development than for plant growth in young soybean plant

Effects of rainfall on the use of foliar analysis for diagnosing boron toxicity in field-grown wheat

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

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