Physiological studies with excised stem segments have implicated the plant hormone @entity9634 ( @entity6207 or auxin) in the regulation of cell elongation. Supporting evidence from intact plants has been somewhat more difficult to obtain, however. Here, we report the identification and characterization of an auxin-mediated cell elongation growth response in @entity958 . When grown in the light at high temperature (29 degreesC), @entity958 seedlings exhibit @entity5588 compared with seedlings grown at 20 degreesC. This temperature-dependent growth response is sharply reduced by mutations in the auxin response or transport pathways and in seedlings containing reduced levels of free @entity6207 . In contrast, mutants deficient in @entity15150 and @entity2271 biosynthesis or in @entity1786 response are unaffected. Furthermore, we detect a corresponding increase in the level of free @entity6207 in seedlings grown at high temperature, suggesting that temperature regulates auxin synthesis or catabolism to mediate this growth response. Consistent with this possibility, high temperature also stimulates other auxin-mediated processes including auxin-inducible gene expression. Based on these results, we propose that growth at high temperature promotes an increase in auxin levels resulting in @entity101 . These results strongly support the contention that endogenous auxin promotes cell elongation in intact plants.

High temperature promotes auxin-mediated hypocotyl elongation in XXXX .

@entity6207 :: ('CHEBI:16411', 'Chemical') :: ['IAA'] @entity2271 :: ('MESH:D000040', 'Chemical') :: ['abscisic acid'] @entity101 :: ('MESH:D006973', 'Disease') :: ['increased hypocotyl elongation'] @entity958 :: ('3702', 'Species') :: ['Arabidopsis thaliana', 'Arabidopsis'] @entity15150 :: ('CHEBI:28833', 'Chemical') :: ['gibberellin'] @entity5588 :: ('MESH:C538010', 'Disease') :: ['dramatic hypocotyl elongation'] @entity9634 :: ('MESH:C030737', 'Chemical') :: ['indole-3-acetic acid'] @entity1786 :: ('MESH:C036216', 'Chemical') :: ['ethylene']
@entity958 :: (3702,Species) :: ['Arabidopsis']
