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<p>In many rice-based agricultural systems worldwide, fields are typically left fallow after the rice harvest, resulting in underutilized land and missed opportunities for improving overall productivity. Introducing a suitable second crop during this interval can enhance land use efficiency and contribute to sustainable farming practices. Rapeseed, as a short-duration oilseed crop with high economic value, presents a promising candidate for post-rice cultivation, provided that genotypes with early maturity and rapid development are identified to match the narrow growing window. This study aimed to identify superior rapeseed genotypes suitable for cultivation after rice by evaluating the phenotypic diversity of ten advanced breeding lines along with three check varieties (Saffar, Delgan, and RGS003) over three cropping seasons at the Rice Research Institute of Iran (RRII). The experiment was conducted using a randomized complete block design with three replications each season. Key agronomic and phenological traits were measured, including seed yield (SY), seeds per silique (SPS), siliques per plant (SPP), 1000-seed weight (TSW), plant height (PH), flowering time (FT), silique initiation (SI), flowering duration (FD), and maturity date (MD). Analysis of variance showed significant effects of genotype, year, and their interaction, indicating considerable genetic variability across years. Factor and cluster analyses performed separately for each season revealed consistent grouping of genotypes based on yield and phenology traits. Seeds per silique (SPS) and siliques per plant (SPP) remained strong contributors to seed yield variation annually. Five genotypes (SRL-98-12, SRL-98-15, SRL-98-16, SRL-98-17, and SRL-98-19) consistently formed superior clusters with high yield and early maturity traits critical for post-rice cropping systems. These genotypes demonstrated strong adaptability to the limited post-rice growing seasons across years and are promising candidates for breeding programs or direct cultivation in rice-based cropping systems aimed at intensifying land use while maintaining high agronomic performance.</p>

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Identifying Superior Rapeseed Genotypes for Post-Rice Cultivation Through Multivariate Analysis

  • 期刊论文

  • 发表日期：

    2025年9月11日

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  • Mohammad Rabiee,
  • Seyedeh Soheila Zarbafi,
  • Hassan Amiri Oghan

摘要

In many rice-based agricultural systems worldwide, fields are typically left fallow after the rice harvest, resulting in underutilized land and missed opportunities for improving overall productivity. Introducing a suitable second crop during this interval can enhance land use efficiency and contribute to sustainable farming practices. Rapeseed, as a short-duration oilseed crop with high economic value, presents a promising candidate for post-rice cultivation, provided that genotypes with early maturity and rapid development are identified to match the narrow growing window. This study aimed to identify superior rapeseed genotypes suitable for cultivation after rice by evaluating the phenotypic diversity of ten advanced breeding lines along with three check varieties (Saffar, Delgan, and RGS003) over three cropping seasons at the Rice Research Institute of Iran (RRII). The experiment was conducted using a randomized complete block design with three replications each season. Key agronomic and phenological traits were measured, including seed yield (SY), seeds per silique (SPS), siliques per plant (SPP), 1000-seed weight (TSW), plant height (PH), flowering time (FT), silique initiation (SI), flowering duration (FD), and maturity date (MD). Analysis of variance showed significant effects of genotype, year, and their interaction, indicating considerable genetic variability across years. Factor and cluster analyses performed separately for each season revealed consistent grouping of genotypes based on yield and phenology traits. Seeds per silique (SPS) and siliques per plant (SPP) remained strong contributors to seed yield variation annually. Five genotypes (SRL-98-12, SRL-98-15, SRL-98-16, SRL-98-17, and SRL-98-19) consistently formed superior clusters with high yield and early maturity traits critical for post-rice cropping systems. These genotypes demonstrated strong adaptability to the limited post-rice growing seasons across years and are promising candidates for breeding programs or direct cultivation in rice-based cropping systems aimed at intensifying land use while maintaining high agronomic performance.