GrainGenes Reference Report: PTS-264-141
Reference
PTS-264-141
Title
Enhanced boron transport into the ear of wheat as a mechanism for boron efficiency
Journal
Plant and Soil
Year
2004
Volume
264
Pages
141-147
Author
Nachiangmai D Dell B Bell R Huang L Rerkasem B
Abstract
Genotypic variation in boron (B) efficiency in wheat ( Triticum aestivum L.) is expressed as large differences in grain set and pollen fertility under low soil B, but the mechanisms responsible for such differences are unknown. This paper aims to determine whether differences in B transport and retranslocation can explain cultivar differences in B efficiency between B-efficient (Fang 60) and B-inefficient (SW41) wheat cultivars. Plants were grown with adequate SUP 11 B (10 microM), until the premeiotic interphase stage in anther development, then transferred into SUP 10 B at 0.1 or 10 microM. After five days, ending at the young microspore stage, plants were returned to adequate SUP 11 B. Plants were harvested at 0, 1 and 5 days after transferring into SUP 10 B, and at anthesis when fresh pollen was examined for viability. After 5 days in 0.1 microM B, pollen viability in SW41 was depressed by 47%, but pollen of Fang 60 was not affected. When B supply was low, the proportion of plant B partitioned into the ear of Fang 60 was almost twice as high as that in SW 41, enabling Fang 60 to maintain B concentration in the ear at 6.8 mg kg SUP -1 dry weight (DW), whereas it dropped to 3.8 mg kg SUP -1 DW in SW 41. Boron accumulation in the ear, when external supply was restricted, did not come from the SUP 11 B previously taken up by the plant. The greater SUP 10 B accumulation in ears of Fang 60 compared to SW 41, with limited external B supply, indicated that B efficiency was associated with xylem transport of B. The greater increase of SUP 10 B: SUP 11 B ratio in the ear of Fang 60 compared to SW 41, over the 5 days of B interruption further indicated that greater B efficiency was associated with a stronger capability for long distance transport of B from the rooting medium into the ear via the xylem rather with than retranslocation of B from vegetative parts
Keyword
GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture.
GrainGenes Reference Report: PTS-264-141
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GrainGenes is a product of the Agricultural Research Service of the US Department of Agriculture. | |||