Chickpea being a winter season crop often experiences heat stress during reproductive phase. For chickpea production, terminal heat stress is one of the major constraints. Plants have built up numerous mechanisms to combat the heat stress. We considered the photosynthetic pigments for heat tolerance. Therefore, in order to investigate the heat tolerance in relation to photosynthetic pigments, a field trial was carried out having 4 contrasting genotypes namely BG 240 and JG 14 (relatively heat tolerant), SBD 377 (moderately tolerant) and ICC 1882 (relatively heat sensitive). Heat stress was imposed by altering the sowing date i.e. normal (18th November) and late sown (18th December). Under delayed sown condition, heat stress was faced by crop starting from flowering stage to crop maturity. Under heat stress condition, heat tolerant genotypes BG 240 and JG 14 maintained higher level of membrane stability, RWC (%), osmolytes, dry matter partitioning, grain yield, heat tolerance index and had higher values of zeaxanthin, quantum yield of PS II (Fv/Fm ratio), non-photochemical quenching (NPQ), photosynthetic rate, level of photosynthetic pigments (chlorophylls and carotenoids) and lower level of violaxanthin, and lipid peroxidation as compared to heat sensitive one (ICC 1882). In addition to this, Fv/Fm ratio and NPQ exhibited positive relationship with heat tolerance which suggested the involvement of xanthophyll cycle pigments in chickpea heat tolerance.

中文翻译：

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叶黄素循环色素可能参与鹰嘴豆（Cicer arietinum L.）的耐热性。

鹰嘴豆是冬季作物，在生殖阶段经常经历热应激。对于鹰嘴豆生产，终端热应激是主要限制因素之一。植物已经建立了许多机制来对抗热应激。我们考虑了光合色素的耐热性。因此，为了研究与光合色素有关的耐热性，进行了具有 4 个对比基因型的田间试验，即 BG 240 和 JG 14（相对耐热）、SBD 377（中等耐热）和 ICC 1882（相对耐热） ）。通过改变播种日期，即正常（11 月 18 日）和晚播（12 月 18 日）施加热应激。在延迟播种条件下，作物从开花期到成熟期都面临热胁迫。在热应激条件下，耐热基因型 BG 240 和 JG 14 保持较高水平的膜稳定性、RWC (%)、渗透物、干物质分配、谷物产量、耐热指数，并具有较高的玉米黄质值、PS II 量子产量（Fv/Fm 比） 、非光化学猝灭 (NPQ)、光合速率、光合色素水平（叶绿素和类胡萝卜素）和较低水平的紫黄质，以及与热敏性物质相比的脂质过氧化（ICC 1882）。除此之外，Fv/Fm 比和 NPQ 与耐热性呈正相关，这表明叶黄素循环色素参与了鹰嘴豆耐热性。非光化学猝灭 (NPQ)、光合速率、光合色素水平（叶绿素和类胡萝卜素）和较低水平的紫黄质以及脂质过氧化与热敏性相比（ICC 1882）。除此之外，Fv/Fm 比和 NPQ 与耐热性呈正相关，这表明叶黄素循环色素参与了鹰嘴豆耐热性。非光化学猝灭 (NPQ)、光合速率、光合色素水平（叶绿素和类胡萝卜素）和较低水平的紫黄质以及脂质过氧化与热敏性相比（ICC 1882）。除此之外，Fv/Fm 比和 NPQ 与耐热性呈正相关，这表明叶黄素循环色素参与了鹰嘴豆耐热性。