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. Chlorophyll a fast fluorescence transient (JIP test), was used to evaluate water deficit (WD) resistance in Lathyrus genus. Our results reveal unaltered photochemical values for all 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 (PI_ABS) 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 (ϕ_Eo) and efficiency with which trapped excitons can move electrons further than Q_A (ψ₀) revealed as important traits related to improved photosynthetic 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.

中文翻译：

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绩效指数：一种快速的工具，用于筛选山thy豆属的抗旱性。

山thy豆属的某些物种是边际土地上最有希望的作物之一，对干旱，洪水和真菌病害的抵抗力很高，而且产量高，种子营养价值高。但是，由于缺乏有关其出色表现的机制和鉴定优良基因型的方法的知识，因而妨碍了其在育种中的正确使用。叶绿素一个快速荧光瞬态（JIP试验），来评价在水分亏缺（WD）电阻山黧豆属。我们的结果表明，所有研究的基因型均显示出对轻度WD的抗性未改变的光化学值。在严重的WD下，两个山thy豆基因型显示出显着的回弹力，保持了光化学效率，这与其他研究的基因型相反。性能指标（PI _ABS）是筛选基因型的最佳参数，可改善WD条件下的性能和谷物产量。此外，我们发现JIP指数是WD下基因型谷物产量的良好指标。电子传输（的量子产率φ_御），并用该激子被捕获可进一步移动电子比效率Q_甲（ψ ₀）揭示作为与改善的光合性能重要的性状，应在未来被利用山黧豆种质改良。本文所述的JIP测试显示是筛选和鉴定具有改善的抗旱性的优良基因型的快速工具。