热带作物学报2026，Vol.47Issue(1)：86-95,10.DOI:10.3969/j.issn.1000-2561.2026.01.009
甘蔗热带种不同基因型对低磷胁迫的响应特征
Response Characteristics of Different Saccharum officinarum L.Geno-types to Low-phosphorus Stress
摘要
Abstract
Sugarcane is a globally important cash crop and bioenergy crop,playing a critical role in promoting economic development in sugarcane-producing countries.Phosphorus is an essential nutrient for plants,and low phosphorus availability in soil often constrains the quality and yield of sugarcane in China.S.officinarum serves as an important genetic foundation for modern sugarcane varieties.Elucidating the low-phosphorus tolerance mechanisms in phospho-rus-efficient genotypes of S.officinarum is of significant theoretical and practical importance for screening and breeding phosphorus-efficient sugarcane varieties,improving phosphorus fertilizer utilization efficiency,and promoting the de-velopment of the sugarcane industry.The study was aimed to explore the response characteristics of different S.offici-narum genotypes under low-phosphorus stress from the perspectives of root morphology and physiological adaptations,identify key factors affecting phosphorus absorption,and provide a theoretical basis for improving nutrient utilization efficiency in sugarcane through root plasticity modification.Phosphorus-efficient S.officinarum genotypes(48 Mouna and Loether)and phosphorus-inefficient genotypes(NC20 and Badila)were used in the study.Under two phosphorus supply conditions,low phosphorus(0.2 μmol/L KH2PO4)and normal phosphorus(1000 μmol/L KH2PO4),comparative analyses were conducted on root morphological indices,low-phosphorus tolerance indices,root activity,acid phos-phatase activity,and other physiological characteristics of each variety.The results indicated that low-phosphorus stress could inhibit the growth and development of various sugarcane tropical varieties to different degrees.Among them,the phosphorus-efficient variety Loether was the least affected by low-phosphorus stress in terms of plant height,stem dry weight,and whole-plant biomass,while its root dry weight and root-to-shoot ratio significantly increased.Low-phosphorus stress promoted increases in total root length,total root surface area,and total root volume in both Loether and 48 Mouna,with Loether exhibiting the most pronounced increase.The specific root length,specific root surface area,and specific root volume of most varieties decreased,with NC20 showing the greatest reduction.Addi-tionally,all varieties exhibited root thinning.Furthermore,under low-phosphorus stress,48 Mouna and Loether demon-strated higher root low-phosphorus tolerance indices,root activity,and phosphorus acquisition capacity.In conclusion,this study reveals that the phosphorus-efficient tropical varieties 48 Mouna and Loether can better optimize root archi-tecture,enhance phosphorus absorption interfaces,maintain strong root activity and enzymatic adaptability,effectively improve phosphorus absorption and utilization efficiency,and exhibit strong adaptability to low-phosphorus stress.关键词
甘蔗/热带种/低磷胁迫/磷效率/根系形态/生理响应Key words
sugarcane/Saccharum officinarum L./low phosphorus stress/phosphorus efficiency/root morphology/physiological and biochemical response分类
农业科技引用本文复制引用
饶席兵,杨丽华,刀静梅,唐思琪,韦彩艳,赵丽萍..甘蔗热带种不同基因型对低磷胁迫的响应特征[J].热带作物学报,2026,47(1):86-95,10.基金项目
国家重点研发计划项目(No.2022YFD2301100) （No.2022YFD2301100）
广西科技重大专项(桂科AA23073001) （桂科AA23073001）
云南省科技计划项目(No.202404BP090025). （No.202404BP090025）
