β-amylase 1 (BAM1) degrades transitory starch to sustain proline biosynthesis during drought stress

Journal of Experimental Botany
Martina ZanellaFrancesca Sparla

Abstract

During photosynthesis of higher plants, absorbed light energy is converted into chemical energy that, in part, is accumulated in the form of transitory starch within chloroplasts. In the following night, transitory starch is mobilized to sustain the heterotrophic metabolism of the plant. β-amylases are glucan hydrolases that cleave α-1,4-glycosidic bonds of starch and release maltose units from the non-reducing end of the polysaccharide chain. In Arabidopsis, nocturnal degradation of transitory starch involves mainly β-amylase-3 (BAM3). A second β-amylase isoform, β-amylase-1 (BAM1), is involved in diurnal starch degradation in guard cells, a process that sustains stomata opening. However, BAM1 also contributes to diurnal starch turnover in mesophyll cells under osmotic stress. With the aim of dissecting the role of β-amylases in osmotic stress responses in Arabidopsis, mutant plants lacking either BAM1 or BAM3 were subject to a mild (150mM mannitol) and prolonged (up to one week) osmotic stress. We show here that leaves of osmotically-stressed bam1 plants accumulated more starch and fewer soluble sugars than both wild-type and bam3 plants during the day. Moreover, bam1 mutants were impaired in proline accumulation and suffered...Continue Reading

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Citations

Mar 10, 2017·The New Phytologist·Matthias Thalmann, Diana Santelia
Aug 17, 2019·Frontiers in Plant Science·Libero GurrieriFrancesca Sparla
Sep 19, 2019·DNA and Cell Biology·Meng-Qi WangLei Zhang
Mar 2, 2019·BMC Evolutionary Biology·Matthias ThalmannDiana Santelia
Apr 19, 2020·Environmental Science and Pollution Research International·Ratan Singh, Dheeraj Rathore
Oct 6, 2017·Journal of Experimental Botany·Gregory J MacNeillMichael J Emes
Nov 2, 2019·International Journal of Molecular Sciences·Lisa FürtauerThomas Nägele
Jan 23, 2020·International Journal of Molecular Sciences·Yanli DuFuti Xie
Oct 10, 2018·Frontiers in Plant Science·Katsiaryna SkryhanAndreas Blennow
Nov 21, 2020·Physiologia Plantarum·Ankush A SaddheSuprasanna Penna
Dec 6, 2020·Plant, Cell & Environment·R Glen UhrigWilhelm Gruissem
Dec 31, 2020·Journal of Experimental Botany·Han DongJingquan Yu
Feb 21, 2021·Journal of Plant Physiology·Takuya Yoshida, Kazuko Yamaguchi-Shinozaki
Mar 8, 2021·Biotechnology for Biofuels·Jose J De VegaSusanne Barth
Apr 10, 2021·BMC Plant Biology·Lidia López-SerranoEduardo Bueso

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