1,721,049 research outputs found
Leaf abscission in peach (Prunus persica L Batsch): ultrastructural and biochemical aspects
No full textIt is generally postulated that abscission is regulated similarly in leaf and fruit. In fact, hormones are produced in the fruit as well as in the leaf blade, and a reduction in fruit integrity may result in rapid abscission, analogous to that observed in deblading. To assess the similarity existing between fruit and leaf abscission, a research program was designed. Results concerning peach fruit abscission had already been published (Rascio et al., 1985). Herein some structural and biochemical aspects of leaf abscission are presented
Inclusioni antocianiche vacuolari in cellule coltivate in vitro di Campthoteca acuminata Decne.
No full textSome observations on phycobilisomes of Pterocladiella capillacea (Gelidiales, Rhodophyta).
No full textStructural and functional alterations induced by two sulfonamide antibiotics on barley plants
No full textInfluence of exogenous sucrose on the greening of oat
No full textThe greening of roots and leaves has been studied in whole oat seedlings grown on White's medium either with or without 2% sucrose. The added nutrient promotes chlorophyll synthesis and chloroplast differentiation in the roots. Yet it manifests a negative effect in the foliar tissues where it accelerates the decline in chlorophyll as well as the chloroplast ultrastructural alterations usually associated with senescence. The negative effect of the nutrient in the leaves is probably a consequence of the addition of exogenous sucrose to the endogenous sugars produced by photosynthesis. The foliar tissues would therefore be in the presence of high sucrose concentrations, which are known to be harmful for the photosynthetic apparatus. SDS-PAGE analysis of thylakoid polypeptides from root and leaf chloroplasts has revealed organ-specific differences in the electrophoretic patterns
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