In addition, [H.sub.2][O.sub.2] works as a signaling molecule in plants under biotic and abiotic stresses, being involved in several processes such as root gravitropism
, tolerance to oxygen deficiency, strengthening of cell wall, senescence, photosynthesis, stomatal closure and in the control of cell cycle (Gechev et al., 2006; Petrov & Breusegem, 2012).
Basipetal auxin transport is required for gravitropism
in roots of Arabidopsis.
Strigolactones regulate rice tiller angle by attenuating shoot gravitropism
through inhibiting auxin biosynthesis.
It has been reported that ABCB19 can enhance gravitropism
of plant roots [30,34], which is conducive to deep rooting.
It appears there may be a lack of negative gravitropism
in this species.
For example, [H.sub.2][O.sub.2] is involved in programing cell death, somatic embryogenesis, response to wounding, root gravitropism
and ABA-mediated stomata closure, besides damaging of cellular macromolecules.
Role of cytokinin and auxin in shaping root architecture: regulating vascular differentiation, lateral root initiation, root apical dominance and root gravitropism
. Annals of Botany, vol.
It is well evidenced that gravity can influence the direction of growth of plants, fungi, and animals, a feature known as gravitropism
. Crustaceans exhibit endogenous circatidal and circadian rhythmicity.
(Not) Keeping the stem straight: a proteomic analysis of maritime pine seedlings undergoing phototropism and gravitropism
. BMC Plant Biol 2010; 10: 217.
The lower growth volume was made by directing branches to grow downward by reducing gravitropism
, and the upper growth volume was made by directing branches upward by increasing phototropism.