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xanthoxin/porumb

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ArticoleStudii cliniceBrevete
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Effects of abscisic acid and xanthoxin on elongation and gravitropism in primary roots of Zea mays.

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We examined the involvement of abscisic acid (ABA) and xanthoxin (Xan) in maize root gravitropism by (1) testing the ability of ABA to allow positive gravitropism in dark-grown seedlings of the maize cultivar LG11, a cultivar known to require light for positive gravitropism of the primary root, (2)

Stomatal closure in response to xanthoxin and abscisic acid.

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The stomata of detached leaves of Commelina communis L., Hordeum vulgare L., Zea mays L., Vicia faba L., Phaseolus vulgaris L. and Xanthium strumarium L. closed when xanthoxin (XAN) was added to the transpiration stream. XAN was approximately half as active as (+)-abscisic acid (ABA) at an

Conversion of xanthoxin to abscisic Acid by cell-free preparations from bean leaves.

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Cell-free extracts from the leaves of Phaseolus vulgaris L. convert xanthoxin to abscisic acid. The enzyme activity in dialyzed or acetone-precipitated extracts shows a strong dependence on either NAD or NADP. The enzyme activity appears to be cytosolic with no significant activity observed in

Root-growth inhibitors from root tips of Zea mays L.

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At least two root-growth-inhibiting substances have been detected in extracts of Zea mays root tips. One has chromatographic properties similar to those of abscisic acid (ABA) and is largely confined to the cap. Another, which has not been identified, is present in the root apex but not in the cap.

Abscisic acid, xanthoxin and violaxanthin in the caps of gravistimulated maize roots.

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The occurrence and distribution of abscisic acid (ABA), xanthoxin (Xa) and the carotenoid violaxanthin (Va) were investigated in root tips of maize (Zea mays L. cv. Merit). In roots grown in the dark, Va and ABA were present in relatively high amounts in the root cap and in low amounts in the

Abscisic acid, xanthoxin and violaxanthin in the caps of gravistimulated maize roots.

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The occurrence and distribution of abscisic acid (ABA), xanthoxin (Xa) and the carotenoid violaxanthin (Va) were investigated in root tips of maize (Zea mays L. cv. Merit). In roots grown in the dark, Va and ABA were present in relatively high amounts in the root cap and in low amounts in the
Maize seeds were germinated in the dark in the presence of the carotenoid synthesis inhibitor norflurazon and the levels of abscisic acid, xanthoxin and total carotenoids were measured in the root cap and in the adjacent 1.5 mm segment. In norflurazon-treated roots abscisic acid levels were markedly
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