Indigenous folk rice cultivars often possess remarkable but unrevealed potential in terms of nutritional attributes and biotic stress tolerance. The unique cooking qualities and blissful aroma of many of these landraces make it an attractive low-cost alternative to high priced Basmati rice. Sub-Himalayan Terai region is bestowed with great agrobiodiversity in traditional heirloom rice cultivars. In the present study, ninety-nine folk rice cultivars from these regions were collected, purified and characterized for morphological and yield traits. Based on traditional importance and presence of aroma, thirty-five genotypes were selected and analyzed for genetic diversity using micro-satellite marker system. The genotypes were found to be genetically distinct and of high nutritive value. The resistant starch content, amylose content, glycemic index and antioxidant potential of these genotypes represented wide variability and ‘Kataribhog’, ‘Sadanunia’, ‘Chakhao’ etc. were identified as promising genotypes in terms of different nutritional attributes. These cultivars were screened further for resistance against blast disease in field trials and cultivars like ‘Sadanunia’, ‘T4M-3-5’, ‘Chakhao Sampark’ were found to be highly resistant to the blast disease whereas ‘Kalonunia’, ‘Gobindabhog’, ‘Konkanijoha’ were found to be highly susceptible. Principal Component analysis divided the genotypes in distinct groups for nutritional potential and blast tolerance. The resistant and susceptible genotypes were screened for the presence of the blast resistant pi genes and association analysis was performed with disease tolerance. Finally, a logistic model based on phenotypic traits for prediction of the blast susceptibility of the genotypes is proposed with more than 80% accuracy.

本土民间水稻品种在营养特性和生物胁迫耐受性方面通常具有显着但尚未揭示的潜力。许多这些地方品种独特的烹饪品质和令人愉悦的香气使其成为高价巴斯马蒂大米的有吸引力的低成本替代品。亚喜马拉雅特莱地区在传统的传家宝水稻品种中拥有巨大的农业生物多样性。在本研究中，收集、纯化和表征了来自这些地区的 99 个民间水稻品种的形态和产量性状。基于香气的传统重要性和存在性，使用微卫星标记系统选择和分析了35个基因型的遗传多样性。发现这些基因型在遗传上是独特的并且具有高营养价值。抗性淀粉含量、直链淀粉含量、这些基因型的升糖指数和抗氧化潜力表现出广泛的变异性，就不同的营养属性而言，“Kataribhog”、“Sadanunia”、“Chakhao”等被确定为有前景的基因型。在田间试验中进一步筛选了这些栽培品种对稻瘟病的抗性，发现“Sadanunia”、“T4M-3-5”、“Chakhao Sampark”等栽培品种对稻瘟病具有高度抗性，而“Kalonunia”、“Gobindabhog” , 'Konkanijoha' 被发现是高度易感的。主成分分析将基因型分为不同组的营养潜力和爆炸耐受性。筛选抗性和易感基因型以确定是否存在抗稻瘟病 就不同的营养属性而言，它们被确定为有前途的基因型。在田间试验中进一步筛选了这些栽培品种对稻瘟病的抗性，发现“Sadanunia”、“T4M-3-5”、“Chakhao Sampark”等栽培品种对稻瘟病具有高度抗性，而“Kalonunia”、“Gobindabhog” , 'Konkanijoha' 被发现是高度易感的。主成分分析将基因型分为不同组的营养潜力和爆炸耐受性。筛选抗性和易感基因型以确定是否存在抗稻瘟病 就不同的营养属性而言，它们被确定为有前途的基因型。在田间试验中进一步筛选了这些栽培品种对稻瘟病的抗性，发现“Sadanunia”、“T4M-3-5”、“Chakhao Sampark”等栽培品种对稻瘟病具有高度抗性，而“Kalonunia”、“Gobindabhog” , 'Konkanijoha' 被发现是高度易感的。主成分分析将基因型分为不同组的营养潜力和爆炸耐受性。筛选抗性和易感基因型以确定是否存在抗稻瘟病 'Chakhao Sampark' 被发现对稻瘟病具有高度抵抗力，而'Kalonunia'、'Gobindabhog'、'Konkanijoha' 被发现高度易感。主成分分析将基因型分为不同组的营养潜力和爆炸耐受性。筛选抗性和易感基因型以确定是否存在抗稻瘟病 'Chakhao Sampark' 被发现对稻瘟病具有高度抵抗力，而'Kalonunia'、'Gobindabhog'、'Konkanijoha' 被发现高度易感。主成分分析将基因型分为不同组的营养潜力和爆炸耐受性。筛选抗性和易感基因型以确定是否存在抗稻瘟病pi基因和关联分析是用疾病耐受性进行的。最后，提出了一种基于表型性状的逻辑模型，用于预测基因型的稻瘟病易感性，准确率超过 80%。