Ⅰ. INTRODUCTION Based upon extensive X-ray diffraction analyses of the potassic white micas from metapelite, Sassi et al. found that the b0 value of muscovite increases with the increase of metamorphic pressure and i...Ⅰ. INTRODUCTION Based upon extensive X-ray diffraction analyses of the potassic white micas from metapelite, Sassi et al. found that the b0 value of muscovite increases with the increase of metamorphic pressure and indicated that such a value can be used as a geobarometer. The metamorphism was classified into 3 pressure types according to the b0 value of the muscovite in the rock studied, viz. the high. medium and low pressure types.展开更多
Cambial activity is a prerequisite for secondary growth in plants; however, regulatory factors controlling the activity of the secondary meristem in radial growth remain elusive. Here, we identified INCREASED CAMBIAL ...Cambial activity is a prerequisite for secondary growth in plants; however, regulatory factors controlling the activity of the secondary meristem in radial growth remain elusive. Here, we identified INCREASED CAMBIAL ACTIVITY （ICA）, a gene encoding a putative pectin methyltransferase, which could function as a modulator for the meristematic activity of fascicular and interfascicular cambium in Arabidopsis. An overexpressing transgenic line, 35S：＇1CA, showed accelerated stern elongation and radial thickening, resulting in increased accumulation of biomass, and increased levels of cytokinins （CKs） and gibberellins （GAs）. Expression of genes encoding pectin methylesterases involved in pectin modification together with pectin methyltransferases was highly induced in 355：：ICA, which might contribute to an increase of methanol emission as a byproduct in 35S：ICA. Methanol treatment induced the expression of GA- or CK-responsive genes and stimulated plant growth. Overall, we propose that ectopic expression of ICA increases cambial activity by regulating CK and GA homeostasis, and methanol emission, eventually leading to stem elongation and radial growth in the inflorescence stem.展开更多
文摘Ⅰ. INTRODUCTION Based upon extensive X-ray diffraction analyses of the potassic white micas from metapelite, Sassi et al. found that the b0 value of muscovite increases with the increase of metamorphic pressure and indicated that such a value can be used as a geobarometer. The metamorphism was classified into 3 pressure types according to the b0 value of the muscovite in the rock studied, viz. the high. medium and low pressure types.
基金the support of “Cooperative Research Program for Agriculture Science & Technology Development (Project No. PJ010953022016)” Rural Development Administration, Korea
文摘Cambial activity is a prerequisite for secondary growth in plants; however, regulatory factors controlling the activity of the secondary meristem in radial growth remain elusive. Here, we identified INCREASED CAMBIAL ACTIVITY （ICA）, a gene encoding a putative pectin methyltransferase, which could function as a modulator for the meristematic activity of fascicular and interfascicular cambium in Arabidopsis. An overexpressing transgenic line, 35S：＇1CA, showed accelerated stern elongation and radial thickening, resulting in increased accumulation of biomass, and increased levels of cytokinins （CKs） and gibberellins （GAs）. Expression of genes encoding pectin methylesterases involved in pectin modification together with pectin methyltransferases was highly induced in 355：：ICA, which might contribute to an increase of methanol emission as a byproduct in 35S：ICA. Methanol treatment induced the expression of GA- or CK-responsive genes and stimulated plant growth. Overall, we propose that ectopic expression of ICA increases cambial activity by regulating CK and GA homeostasis, and methanol emission, eventually leading to stem elongation and radial growth in the inflorescence stem.
