The Effects of Extreme Drought Stress on Growth and Water Content in Pasture Brome and Perennial Ryegrass

doi:10.11733/j.issn.1007-0435.2024.12.016

Acta Agrestia Sinica ›› 2024, Vol. 32 ›› Issue (12): 3807-3818.DOI: 10.11733/j.issn.1007-0435.2024.12.016

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The Effects of Extreme Drought Stress on Growth and Water Content in Pasture Brome and Perennial Ryegrass

ZHANG Yong-mei¹, HU Hai-ying², BAI Xiao-ming³, MATTHEW Cory⁴, GARCÍA-FAVRE Javier⁴, ORDÓÑEZ Iván P.^4,5

1. State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou, Gansu Province 730070, China;
2. College of Forestry and Grassland, Ningxia University, Yinchuan, Ningxia 750021, China;
3. Pratacultural College, Gansu Agricultural University, Lanzhou, Gansu Province 730070, China;
4. School of Agriculture and Environment, Massey University, Palmerston North 4442, New Zealand;
5. Instituto de Investigaciones Agropecuarias, INIA, Kampenaike, Punta Arenas 6212707, Chile

Received:2024-01-30 Revised:2024-05-10 Online:2024-12-15 Published:2024-12-14

极干旱胁迫对雀麦、多年生黑麦草生长和体内水分的影响

张咏梅¹, 胡海英², 白小明³, Matthew Cory⁴, García-Favre Javier⁴, Ordóñez Iván P^4,5

1. 甘肃农业大学干旱生境作物学国家重点实验室, 甘肃兰州 730070;
2. 宁夏大学林业与草业学院, 宁夏银川 750021;
3. 甘肃农业大学草业学院, 甘肃兰州 730070;
4. 农业与环境学院梅西大学, 北帕默斯顿 4442;
5. 坎佩奈克农艺研究所, 麦哲伦蓬塔阿雷纳斯 6212707

通讯作者: 白小明,E-mail:baixm@gsau.edu.cn
作者简介:张咏梅(1974-),女,汉族,甘肃武威人,博士,副研究员,主要从事草业科学与植物生理学研究,E-mail:zhangyongm@gsau.edu.cn;
基金资助:
甘肃省科技计划项目(20 JR10RA564)；甘肃省林草局草原生态修复治理科技支撑项目(GSLC-2020-3)资助

Abstract

Abstract: In order to study the effects of extreme drought on growth of forage grasses, perennial ryegrass (Lolium perenne，Lp) and pasture brome (Bromus valdivianus，Bv) were used as materials in pot experiment. 80%-85% plant available water (PAW) (well watered) and 20%-25% PAW (extreme drought) were applied to analyze adaptive changes of growth and responses to water status in forage grasses to drought stress. The results indicated that:1) Under 80%-85% PAW, there were no dramatic differences between Bv and Lp in biomass accumulation, water potential (WP), relative water content (RWC) and net photosynthesis rate (Pn). However, Bv had larger and heavier blade than Lp and its transpiration rate (Tr), total conductance to CO₂ (CndCO₂) and conductance to H₂O(Gs) were markedly higher than those in Lp. While Lp had slender, juicy blades and more tillers, instantaneous water use efficiency (iWUE) of Lp was 1.63 times of Bv. 2) Under 20%-25% PAW extreme drought, the growth of two forage grasses were not completely consistent, leaf turgid weight, dry weight and blade area showed opposite trend, but were not significant difference compared to that of the well watered condition. Pn, Tr, CndCO₂, Gs and RWC in Bv and Lp observably decreased, especially WP reduced by 1.60 MPa, which resulted in dead blade ratio and blade temperature difference increasing. In conclusion, Bv and Lp had similar growth characteristic in biomass accumulation and different water use models. When suffering extreme drought, two forage grasses from different species, their drought tolerance mechanism having some commonalities, improved their drought resistance by enhancing blade water retention, reducing water recycle and cutting down transpiration water loss.

Key words: Drought stress, Photosynthesis, Transpiration, Biomass accumulation, Instantaneous water use efficiency (iWUE), Water potential

摘要： 为研究极端干旱对牧草生长的影响，选择多年生黑麦草(Lolium perenne，Lp)和雀麦(Bromus valdivianus，Bv)给予80%~85%植物有效水(Plant available water,PAW)和20%~25% PAW 2种水分处理，分析两种牧草生长及体内水分状况对干旱胁迫的响应。研究表明：80%~85% PAW充足水分下，两种牧草生物量积累、水势(Water potential,WP)、相对含水量(Relative water content,RWC)和净光合速率(Net photosynthetic rate,Pn)无明显种间差异。Bv叶片宽而重,蒸腾速率(Transpiration rate,Tr)、CO₂总导度(Total conductance to CO₂,CndCO₂)和气孔导度(Conductance to H₂O,Gs)显著高于Lp。而Lp分蘗多、叶多汁,瞬时水分利用效率是Bv的1.63倍。20%~25% PAW对两种牧草生长影响不完全一致，叶饱和重、干重和叶面积有相反变化趋势，但与充足水分相比差异不显著；Pn，Tr，CndCO₂，Gs和RWC则极显著降低，WP极显著降低了1.60 MPa，致使枯叶占比和叶温差显著升高。总之，雀麦和多年生黑麦草生长相近，水分利用模式不同；遭受极端干旱，不同种的两种牧草耐旱机制具有一定的共性，通过增强叶片持水力、降低水分循环、减少蒸腾失水以提高牧草抗旱性。

关键词: 干旱胁迫, 光合作用, 蒸腾作用, 生物量积累, 瞬时水分利用效率, 水势

CLC Number:

S543

ZHANG Yong-mei, HU Hai-ying, BAI Xiao-ming, MATTHEW Cory, GARCÍA-FAVRE Javier, ORDÓÑEZ Iván P.. The Effects of Extreme Drought Stress on Growth and Water Content in Pasture Brome and Perennial Ryegrass[J]. Acta Agrestia Sinica, 2024, 32(12): 3807-3818.

张咏梅, 胡海英, 白小明, Matthew Cory, García-Favre Javier, Ordóñez Iván P. 极干旱胁迫对雀麦、多年生黑麦草生长和体内水分的影响[J]. 草地学报, 2024, 32(12): 3807-3818.

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The Effects of Extreme Drought Stress on Growth and Water Content in Pasture Brome and Perennial Ryegrass

极干旱胁迫对雀麦、多年生黑麦草生长和体内水分的影响

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