Combined effects of drought and CO 2 enrichment on foliar metabolites of potato (Solanum tuberosum L.) cultivars

[摘要] Drought invokes a variety of metabolic alterations in plant leaves to cope with stress situations. To understand the effects of CO 2 and drought stress for leaf metabolic changes in potato [ Solanum tuberosum (L)], two contrasting potato cultivars Harley Blackwell (HB, an early maturing, newer cultivar) and Snowden (SD, an established, full-season cultivar) were tested under water-limited conditions and CO 2 enrichment. The results revealed that most of the drought-triggered metabolites were lower in HB compared to SD. However, HB showed quicker adjustments in the metabolic processes such as conversion of starch into soluble sugars and biosynthesis of phenylalanine and other compatible solutes at the early stages of the drought progression. Moreover, the existence of genotypic differences for leaf water potential (LWP) in response to CO 2 enrichment was evident. Our study provides insights into the possible metabolic strategies of drought tolerance in potato cultivars under ambient and elevated CO 2 .

[学科分类] 纳米科学和纳米技术

[关键词] Drought;CO 2 enrichment;genotype;leaf water potential;metabolites