Molecular Plant Breeding 2025, Vol.16, No.2, 119-124 http://genbreedpublisher.com/index.php/mpb 119 Research Report Open Access Comparative Analysis of Yield and Growth Characteristics of Late-Season Double-Cropping Rice Varieties in Rui’an City DongshuWu 1,2 1 Rui’an Cunzong Agricultural Machinery Professional Cooperative, Rui’an, 325208, Zhejiang, China 2 Zhejiang Agronomist College, Hangzhou, 310021, Zhejiang, China Corresponding email: 254456653@qq.com Molecular Plant Breeding, 2025, Vol.16, No.2 doi: 10.5376/mpb.2025.16.0012 Received: 22 Feb., 2025 Accepted: 23 Mar., 2025 Published: 31 Mar., 2025 Copyright © 2025 Wu, This is an open access article published under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Preferred citation for this article: Wu D.S., 2025, Comparative analysis of yield and growth characteristics of late-season double-cropping rice varieties in rui’an city, Molecular Plant Breeding, 16(2): 119-124 (doi: 10.5376/mpb.2025.16.0012) Abstract This study selected four common late-season double-cropping rice varieties in Rui’an City (Teyou 1332, Huazheyou 261, Yongyou 1540, and Teyou 217) and focused on analyzing their yield components, panicle grain structure, and growth period. The results showed significant differences in yield among these four varieties. Teyou 217 had the highest yield (550.8 kg/mu), primarily due to its high number of effective panicles (248,500 panicles/mu). In contrast, Yongyou 1540 had the lowest yield (480.0 kg/mu), despite having the highest number of grains per panicle (207.3 grains/panicle), as its effective panicle number was the lowest (159,100 panicles/mu), which became the key limiting factor for its yield. Regarding the growth period, the varieties ranged from 120 to 136 days. Yongyou 1540 had the shortest growth period (120 days), reaching maturity the fastest, making it suitable for early-maturing cultivation. Meanwhile, Teyou 217 had the longest growth period (136 days), allowing for extended growth and increased dry matter accumulation. Overall, increasing the number of effective panicles is the key to achieving stable and high yields in late-season double-cropping rice. Additionally, when selecting varieties, factors such as growth period, disease resistance, rice quality, and field adaptability should be considered to identify the most suitable varieties for local cultivation conditions. Keywords Rui’an City; Late-season double-cropping rice; Yield components; Panicle grain structure; Growth period 1 Introduction Rui’an City is located in southeastern Zhejiang, characterized by a subtropical maritime monsoon climate with distinct seasons, abundant heat resources, and favorable water and temperature conditions, making it highly suitable for rice cultivation. The city’s average annual temperature is 17.9 ℃, with abundant rainfall and an average annual precipitation of 1 110~2 200 mm. Good temperature, light, water and land resources provide good natural conditions for rice production. It is not only suitable for rice cultivation, but also can grow two crops of rice a year (Cao et al., 2023). Rui’an City, as the main grain-producing city in Zhejiang Province, is known as the “granary of southern Zhejiang” (Zheng et al., 2019). In 2024, the city’s grain crop planting area will reach 18 000 hectares, and the total grain output will reach 113 900 tons, of which rice is the most important local grain crop, accounting for more than 90%. In 2024, the city's rice planting area will be 16 400 hectares, accounting for 91.05% of the total planting area of grain crops, and the total rice output will be 108 100 tons, accounting for 94.90% of the total grain output. Among them, the continuous late rice planting area is 6 000 hectares, accounting for 35.21% of the rice planting area that year, and its output is 36 000 tons, accounting for 33.30% of the total rice output that year. It is an important part of Ruian's rice production system, second only to early rice. Continuous cropping of late rice refers to an efficient farming method in which late rice is planted immediately after early rice is harvested in the same paddy field. This planting method makes full use of the high temperature, sufficient light and water conditions in summer and autumn, so that rice has a faster tillering speed in the early growth period, which is conducive to the formation of a higher number of effective panicles; the large temperature difference between day and night in the late growth period prolongs the grain filling time, reduces respiratory consumption, and is conducive to the accumulation of dry matter and grain fullness, thereby increasing grain weight and improving rice quality (Wu et al., 2024).
RkJQdWJsaXNoZXIy MjQ4ODYzNA==