Developmental plasticity in Arabidopsis thaliana under combined cold and water deficit stresses during flowering stage

FERNANDEZ NEVYL, SOLANGE; BATTAGLIA MARINA E

Virtual, hosted in Argentina

Congreso; XXXIII Argentinian Meeting of Plant Physiology; 2021

Sociedad Argentina de Fisiologia Vegetal

In nature,plants are exposed to multiple and simultaneous abiotic stresses that influencetheir growth, development, and reproduction. In the last years, the study ofcombined stresses has aroused the interest to know the physiological andmolecular responses, because these new stress conditions are probed to bedifferent from the sum of the individual stress. We are interested in the studyof the acclimation of plants growing under the combination of cold and waterdeficit stresses prevalent in cold-arid or semi-arid climates worldwide. Wehypothesized that the reproduction of the acclimated plants will be compromisedand affected. Arabidopsis plants were submitted to long-term combinedstress from the beginning to the reproductive stage, when floral bud wasvisible, until the silique development.Our results demonstrate severe morpho-anatomical changes after acclimation to combinedstress. Inflorescence stem morphology was altered having a delayed bolting anda limited growth. Flowering and silique formation were delayed, and a highersize in the corolla and the petals was observed. Flower and silique number wereseverely diminished as a result of combined stress, unlike acclimated plants toindividual cold stress. These traits were recovered after deacclimation tooptimal conditions and plants achieved similar silique production as controlplants. The long-term stress results suggest that there is not a singledominant stress, but there is an alternating dominance depending on thestructure or the plant stage development evaluated. @font-face{font-family:"Cambria Math";panose-1:2 4 5 3 5 4 6 3 2 4;mso-font-charset:0;mso-generic-font-family:roman;mso-font-pitch:variable;mso-font-signature:3 0 0 0 1 0;}@font-face{font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;mso-font-charset:0;mso-generic-font-family:swiss;mso-font-pitch:variable;mso-font-signature:-536859905 -1073732485 9 0 511 0;}@font-face{font-family:"Calibri Light";panose-1:2 15 3 2 2 2 4 3 2 4;mso-font-charset:0;mso-generic-font-family:swiss;mso-font-pitch:variable;mso-font-signature:-536859905 -1073732485 9 0 511 0;}p.MsoNormal, li.MsoNormal, div.MsoNormal{mso-style-unhide:no;mso-style-qformat:yes;mso-style-parent:"";margin:0cm;mso-pagination:widow-orphan;font-size:12.0pt;font-family:"Calibri",sans-serif;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-fareast-language:EN-US;}p{mso-style-noshow:yes;mso-style-priority:99;mso-margin-top-alt:auto;margin-right:0cm;mso-margin-bottom-alt:auto;margin-left:0cm;mso-pagination:widow-orphan;font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-font-family:"Times New Roman";}.MsoChpDefault{mso-style-type:export-only;mso-default-props:yes;font-family:"Calibri",sans-serif;mso-ascii-font-family:Calibri;mso-ascii-theme-font:minor-latin;mso-fareast-font-family:Calibri;mso-fareast-theme-font:minor-latin;mso-hansi-font-family:Calibri;mso-hansi-theme-font:minor-latin;mso-bidi-font-family:"Times New Roman";mso-bidi-theme-font:minor-bidi;mso-font-kerning:0pt;mso-ligatures:none;mso-fareast-language:EN-US;}div.WordSection1{page:WordSection1;}