Alteration in morpho-physiological attributes of Leymus chinensis (Trin.) Tzvelev by exogenous application of brassinolide under varying levels of drought stress

ABSTRACT Climate change and prolong drought adversely affect the grassland ecosystem, is precarious environmental constraint restricting plant growth and productivity. An experiment was conducted to alleviate adverse impacts of drought on physiochemical and morphological attributes of Leymus chinens...

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Autores principales:	Lv,Jun, Zong,Xue-feng, Shakeel Ahmad,Anjum, Wu,Xiao, Wu,Chao, Li,Yun-peng, Wang,San-gen
Lenguaje:	English
Publicado:	Instituto de Investigaciones Agropecuarias, INIA 2020
Materias:	Brassinolide (BR) drought stress Leymus chinensis osmotic adjustment photosynthetic performance.
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392020000100061
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spelling	oai:scielo:S0718-583920200001000612020-02-25Alteration in morpho-physiological attributes of Leymus chinensis (Trin.) Tzvelev by exogenous application of brassinolide under varying levels of drought stressLv,JunZong,Xue-fengShakeel Ahmad,AnjumWu,XiaoWu,ChaoLi,Yun-pengWang,San-gen Brassinolide (BR) drought stress Leymus chinensis osmotic adjustment photosynthetic performance. ABSTRACT Climate change and prolong drought adversely affect the grassland ecosystem, is precarious environmental constraint restricting plant growth and productivity. An experiment was conducted to alleviate adverse impacts of drought on physiochemical and morphological attributes of Leymus chinensis (Trin.) Tzvelev using brassinosteroid (BR). Treatments comprised well watered control (soil water contents 80%-85%) including Control (T0) and Control+ BR (TB0), moderate drought stress (soil water contents 50%-55%) including (T1) and T1+ BR (TB1) and severe drought stress (soil water contents 30%-35%) including (T2) and T2+ BR (TB2), they were laid out in completely randomized design with five replicates. Drought stress significantly impaired growth, osmotic substances, photosynthetic rate, and other physiochemical process. Moreover, perturbation in recorded attributes was aggravated by increasing drought severity from moderate to severe. Nevertheless, BR application (0.1 mg L-1) improved plant weight (38.8%-46.2%), relative water content (23.4%-29.1%), chlorophyll a (16.6%-56.5%), chlorophyll b (8.5%-16.9%), carotenoids (29.1%-67.3%), soluble sugars (1.7%-29.4%), free amino acids (15.4%-19.4%), and proline content (45.2%-79.4%); while, lowered malondialdehyde (34.8%-45.4%) at each level of drought. Likewise, BR application enhanced net photosynthetic rate (69.8%-165.1%), transpiration rate (45.0%-146.9%), water utilization efficiency (9.3%-16.0%), carboxylation utilization efficiency (80%- 250%), sunlight utilization efficiency (66.6%-158.8%) and improved chlorophyll fluorescence characteristics at each level of drought, as compared to untreated controls. The adverse implications on physiochemical and morphological attributes were aggravated with the enhancing severity of drought from control to severe drought. Yet, 0.1 mg L-1 exogenous BR improved morphological and physiochemical attributes remarkably over respective controls and hence can be used to improve growth of drought stressed L. chinensis.info:eu-repo/semantics/openAccessInstituto de Investigaciones Agropecuarias, INIAChilean journal of agricultural research v.80 n.1 20202020-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392020000100061en10.4067/S0718-58392020000100061
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Brassinolide (BR) drought stress Leymus chinensis osmotic adjustment photosynthetic performance.
spellingShingle	Brassinolide (BR) drought stress Leymus chinensis osmotic adjustment photosynthetic performance. Lv,Jun Zong,Xue-feng Shakeel Ahmad,Anjum Wu,Xiao Wu,Chao Li,Yun-peng Wang,San-gen Alteration in morpho-physiological attributes of Leymus chinensis (Trin.) Tzvelev by exogenous application of brassinolide under varying levels of drought stress
description	ABSTRACT Climate change and prolong drought adversely affect the grassland ecosystem, is precarious environmental constraint restricting plant growth and productivity. An experiment was conducted to alleviate adverse impacts of drought on physiochemical and morphological attributes of Leymus chinensis (Trin.) Tzvelev using brassinosteroid (BR). Treatments comprised well watered control (soil water contents 80%-85%) including Control (T0) and Control+ BR (TB0), moderate drought stress (soil water contents 50%-55%) including (T1) and T1+ BR (TB1) and severe drought stress (soil water contents 30%-35%) including (T2) and T2+ BR (TB2), they were laid out in completely randomized design with five replicates. Drought stress significantly impaired growth, osmotic substances, photosynthetic rate, and other physiochemical process. Moreover, perturbation in recorded attributes was aggravated by increasing drought severity from moderate to severe. Nevertheless, BR application (0.1 mg L-1) improved plant weight (38.8%-46.2%), relative water content (23.4%-29.1%), chlorophyll a (16.6%-56.5%), chlorophyll b (8.5%-16.9%), carotenoids (29.1%-67.3%), soluble sugars (1.7%-29.4%), free amino acids (15.4%-19.4%), and proline content (45.2%-79.4%); while, lowered malondialdehyde (34.8%-45.4%) at each level of drought. Likewise, BR application enhanced net photosynthetic rate (69.8%-165.1%), transpiration rate (45.0%-146.9%), water utilization efficiency (9.3%-16.0%), carboxylation utilization efficiency (80%- 250%), sunlight utilization efficiency (66.6%-158.8%) and improved chlorophyll fluorescence characteristics at each level of drought, as compared to untreated controls. The adverse implications on physiochemical and morphological attributes were aggravated with the enhancing severity of drought from control to severe drought. Yet, 0.1 mg L-1 exogenous BR improved morphological and physiochemical attributes remarkably over respective controls and hence can be used to improve growth of drought stressed L. chinensis.
author	Lv,Jun Zong,Xue-feng Shakeel Ahmad,Anjum Wu,Xiao Wu,Chao Li,Yun-peng Wang,San-gen
author_facet	Lv,Jun Zong,Xue-feng Shakeel Ahmad,Anjum Wu,Xiao Wu,Chao Li,Yun-peng Wang,San-gen
author_sort	Lv,Jun
title	Alteration in morpho-physiological attributes of Leymus chinensis (Trin.) Tzvelev by exogenous application of brassinolide under varying levels of drought stress
title_short	Alteration in morpho-physiological attributes of Leymus chinensis (Trin.) Tzvelev by exogenous application of brassinolide under varying levels of drought stress
title_full	Alteration in morpho-physiological attributes of Leymus chinensis (Trin.) Tzvelev by exogenous application of brassinolide under varying levels of drought stress
title_fullStr	Alteration in morpho-physiological attributes of Leymus chinensis (Trin.) Tzvelev by exogenous application of brassinolide under varying levels of drought stress
title_full_unstemmed	Alteration in morpho-physiological attributes of Leymus chinensis (Trin.) Tzvelev by exogenous application of brassinolide under varying levels of drought stress
title_sort	alteration in morpho-physiological attributes of leymus chinensis (trin.) tzvelev by exogenous application of brassinolide under varying levels of drought stress
publisher	Instituto de Investigaciones Agropecuarias, INIA
publishDate	2020
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392020000100061
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Alteration in morpho-physiological attributes of Leymus chinensis (Trin.) Tzvelev by exogenous application of brassinolide under varying levels of drought stress

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