Performance index: An expeditious tool to screen for improved drought resistance in the Lathyrus genus  

作　　者：Susana Silvestre Susana de Sousa Araújo Maria Carlota Vaz Patto Jorge Marques da Silva 

机构地区：[1]Center for Biodiversity,Functional and Integrative Genomics(BioFIG)and Department of Plant Biology,Faculty of Science,University of Lisbon,Campo Grande [2]Animal and Veterinary Sciences Research Center,Tropical Research Institute,(IICT‐CVZ),Faculty of Veterinary Medicine [3]Plant Cell Biotechnology Lab,Institute for Chemistry and Biological Technology António Xavier-New University of Lisbon(ITQB‐UNL)

出　　处：《Journal of Integrative Plant Biology》2014年第7期610-621,共12页植物学报（英文版）

基　　金：support from Fundacao para a Ciência e Tecnologia from Portugal is acknowledged through the research projects PTDC/AGR‐GPL/103285/2008,PTDC/AGR‐GPL/099866/2008,Pest‐OE/EQB/LA0004/2011;Research Contracts by the Ciência 2008 programs(S.S.Araújo and M.C.Vaz Patto)

摘　　要：Some species of the Lathyrus genus are among the most promising crops for marginal lands, with high resilience to drought, flood, and fungal diseases, combined with high yields and seed nutritional value. However, lack of knowledge on the mechanisms underlying its outstanding performance and methodologies to identify elite genotypes has hampered its proper use in breeding. Chlorophyl a fast fluorescence transient （JIP test）, was used to evaluate water deficit （WD） resistance in Lathyrus genus. Our results reveal unaltered photochemical values for al studied genotypes showing resistance to mild WD. Under severe WD, two Lathyrus sativus genotypes showed remarkable resilience maintaining the photochemical efficiency, contrary to other genotypes studied. Performance index （PIABS） is the best parameter to screen genotypes with improved performance and grain production under WD. Moreover, we found that JIP indices are good indicators of genotypic grain production under WD. Quantum yield of electron transport （wEo） and efficiency with which＆trapped excitons can move electrons further than QA （c0） revealed as important traits related to improved photosyn-thetic performance and should be exploited in future Lathyrus germplasm improvements. The JIP test herein described showed to be an expeditious tool to screen and to identify elite genotypes with improved drought resistance.Some species of the Lathyrus genus are among the most promising crops for marginal lands, with high resilience to drought, flood, and fungal diseases, combined with high yields and seed nutritional value. However, lack of knowledge on the mechanisms underlying its outstanding performance and methodologies to identify elite genotypes has hampered its proper use in breeding. Chlorophyl a fast fluorescence transient （JIP test）, was used to evaluate water deficit （WD） resistance in Lathyrus genus. Our results reveal unaltered photochemical values for al studied genotypes showing resistance to mild WD. Under severe WD, two Lathyrus sativus genotypes showed remarkable resilience maintaining the photochemical efficiency, contrary to other genotypes studied. Performance index （PIABS） is the best parameter to screen genotypes with improved performance and grain production under WD. Moreover, we found that JIP indices are good indicators of genotypic grain production under WD. Quantum yield of electron transport （wEo） and efficiency with which＆trapped excitons can move electrons further than QA （c0） revealed as important traits related to improved photosyn-thetic performance and should be exploited in future Lathyrus germplasm improvements. The JIP test herein described showed to be an expeditious tool to screen and to identify elite genotypes with improved drought resistance.

关 键 词：Grain production JIP test Lathyrus germplasm photochemical performance water deficit 

分 类 号：Q943.2[生物学—植物学]