Drought-induced variations in nutritional composition of grain and bran of contrasting rice genotypes

IF 1.6 4区农林科学 Q2 AGRONOMY

Cereal Research Communications Pub Date : 2024-01-20 DOI:10.1007/s42976-023-00485-0

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Abstract

Drought is a key environmental element that affects rice (Oryza sativa L.) productivity and quality. Control and drought-treated rice grain (milled) and bran fractions of two contrasting rice genotypes (N22-drought-tolerant and IR64-drought-sensitive) were evaluated based on proximate composition, vitamins, minerals, and nutritional quality indices. Except for carbohydrates and amylose content, bran from both genotypes had higher concentrations of all parameters (proximate, minerals, vitamins, phenols, amino acids, and phytic acid) analyzed in this study. Protein level ranged from 9–11% in grain to 13–15% in bran. Macronutrients (Na, Ca, K, Mg, P) increased after drought in both genotypes. Under drought, thiamine level ranged from 0.07 to 1.97 mg/100 g, riboflavin level from 0.02 to 0.43 mg/100 g, and α-tocopherol from 1.67 to 8.34 mg/100 g in both fractions. N22 showed higher amylose (20.44% and 4.84%) and phenol (0.46 mg/GAE and 2.54 mg/GAE) content in both grain and bran fractions under drought condition. Proline accumulated at higher concentration (2.732 g/100 g) than other amino acids in N22 under drought. Phytic acid ranged from 0.213 to 2.752 g/100 g in drought. To the best of our knowledge, this is the first preliminary report on nutritional quality analysis of rice grain and bran under drought stress. The current findings may help breeders in development of high-quality, drought-tolerant rice varieties, and will also provide a strong foundation for utilizing bran as an essential food ingredient to improve human nutrition and may help breeders to use this tolerant genotype as better parents in further crossings.

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干旱引起的不同水稻基因型的谷粒和麸皮营养成分变化

摘要干旱是影响水稻（Oryza sativa L.）产量和质量的关键环境因素。根据近似物成分、维生素、矿物质和营养质量指标，对两种截然不同的水稻基因型（N22-耐旱型和 IR64-干旱敏感型）的对照稻谷和经干旱处理的稻谷（碾米）及糠麸部分进行了评估。除碳水化合物和直链淀粉含量外，两种基因型的麸皮在本研究中分析的所有参数（近似物、矿物质、维生素、酚类、氨基酸和植酸）中含量都较高。蛋白质含量从谷粒的 9-11% 到麸皮的 13-15% 不等。两种基因型的宏观营养元素（Na、Ca、K、Mg、P）在干旱后都有所增加。在干旱条件下，两种基因型的硫胺素含量从 0.07 至 1.97 毫克/100 克不等，核黄素含量从 0.02 至 0.43 毫克/100 克不等，α-生育酚含量从 1.67 至 8.34 毫克/100 克不等。在干旱条件下，N22 在谷粒和麸皮组分中表现出较高的直链淀粉（20.44% 和 4.84%）和酚（0.46 mg/GAE 和 2.54 mg/GAE）含量。在干旱条件下，N22 中脯氨酸的累积浓度（2.732 克/100 克）高于其他氨基酸。在干旱条件下，植酸的含量范围为 0.213 至 2.752 克/100 克。据我们所知，这是第一份关于干旱胁迫下稻谷和麸皮营养品质分析的初步报告。目前的研究结果可能有助于育种人员开发优质、耐旱的水稻品种，也将为利用米糠作为改善人类营养的重要食品成分奠定坚实的基础，并可能有助于育种人员在进一步杂交中利用这种耐旱基因型作为更好的亲本。

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来源期刊

Cereal Research Communications AGRONOMY-

CiteScore

3.40

自引率

6.20%

发文量

审稿时长

6-12 weeks

期刊介绍： This journal publishes original papers presenting new scientific results on breeding, genetics, physiology, pathology and production of primarily wheat, rye, barley, oats and maize.