Sampling the Transpiration Stream in Woody Plants

Jones, O. P.; Rowe, R.

doi:10.1038/219403a0

Cited by 7 publications

(2 citation statements)

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“…Raven (20), using reported values of B concentration per unit dry weight of plant tops and volume of water transpired per unit increase in dry weight, calculated the expected B concentration in the xylem stream to be 0.01-0.6 ppm. The range in Ca concentrations in xylem exudate observed in this study (30-80 ppm) compares well with concentrations reported in the xylem exudate of Lupinus albus L. (60-90 ppm) (13), Quercus rubra L. (17-18 ppm) (23), apple (110-120 ppm), and pear (120-180 ppm) (16).…”

Section: Discussionsupporting

confidence: 87%

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Xylem Differentiation and Boron Accumulation in ‘Italian’ Prune Flower Buds

Hanson

Breen

1985

J. Amer. Soc. Hort. Sci.

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Since B levels in prune (Prunus domestica L.) flowers may affect fruit set, the accumulation of B in buds was studied for 2 months prior to bloom to determine when B enters buds and the importance of the xylem as the supply route. Bud anatomy and the distribution of azosulfamide dye in excised prune twigs indicated that xylem in the axes of flower buds differentiated and became functional only when buds begin to swell, 5 weeks before bloom. Discontinuous xylem connections prior to bloom may impede B movement into dormant buds. In intact trees, B accumulated in buds slowly before bud swelling, but rapidly as buds accumulated dry matter from swelling until bloom. The concentration of B in xylem exudate was unchanged from 19 Jan. until bloom on 1 Apr., whereas marked increases in the concentrations of P, K, Ca, and S began 5 weeks before bloom. These changes suggest that the remobilization of B in the xylem of branches prior to bloom is more limited than that of other elements. Transpiration from buds was calculated from the rate of Ca accumulation in buds and Ca concentrations in xylem exudate, by assuming all Ca entered buds via the xylem. Using calculated daily transpiration rates and concentrations in xylem exudate, it was estimated that only 26% of the B entering buds was supplied by the xylem.

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Section: Discussionsupporting

confidence: 87%

“…Discrete early flowering genes have been identified in all species that have been studied in detail (10,16). In peas, recessive early flowering alleles have been reported by Gottschalk (4) and Wellensiek (17).…”

Section: R Eview O F L Iteraturementioning

confidence: 98%