Seedling Establishment Rate of Double-cropping and Direct-seeded Rice under Submergence in South China: Germplasm Screening and Comparative Analysis

doi:10.11924/j.issn.1000-6850.casb2023-0389

Abstract

Abstract:

The widely used rice varieties (parents) in the rice-growing area of South China were used as test materials and the field direct seeding and flooding seedling emergence tests were conducted in both early and late seasons, respectively, in South China. The aim was to identify and screen out germplasm with higher rate of seedling establishment under flooding and submergence conditions (under the condition of water depth of 6 cm), and provide material support for the development of new rice varieties suitable for direct seeding under natural conditions in South China. The results showed that the seedling establishment rate under flooding and submergence conditions in the early season was significantly higher than that in the late season, and there was no significant correlation between the rates of seedling establishment in the early and late seasons (R²=-0.1253). In the early season, the rates of seedling establishment of ‘Francis’, ‘starbonett99’, ‘Runfeng B’, ‘Kasalath’, and ‘Yuekang 1614’, were the highest five materials, up to 65.0% to 76.5%. Cluster analysis grouped these five materials into the same cluster I. In the late season, the rates of seedling establishment of ‘Yujingruanzhan’ and ‘Conventional Rice 5’ were the highest ones, but only accounted for 42.5% and 39.5%, respectively, and they were also grouped into the same cluster. This indicates that due to different climatic conditions in the early and late rice-growing seasons in South China, different types of germplasm materials with high seedling establishment rate under flooding and submergence conditions should be selected for the breeding of new direct-seeded rice varieties.

Key words: rice, germplasm screening, rate of seedling establishment, submergence, direct-seeded rice, South China

ZHU Manshan, FU Chongyun, LIU Wuge, LIAO Yilong, MA Xiaozhi, WANG Feng. Seedling Establishment Rate of Double-cropping and Direct-seeded Rice under Submergence in South China: Germplasm Screening and Comparative Analysis[J]. Chinese Agricultural Science Bulletin, 2024, 40(18): 1-8.

Figures/Tables 5

References 34

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类别	早季和晚季	仅供早季	仅供晚季
常规籼稻	合丰占、常规稻5（2015 晚造广东省区试收集常规稻中熟组5，下同）、五广占、粤禾丝苗	粤抗1614、广超1614、中早35、谷梅4号、广金占、新黄占、白粳占、黄丝莉占、粤抗1612、海稻86、新1613、kasalath(CK2)	玉晶软占、黄丝莉占、广粤占、新黄占、南八糯、南晶占、华粤软占、黄银占、粤油丝苗、合莉丝苗、象竹香丝苗、美香占2号、黄软秀占、五粤占2号、常规稻1、常规稻2、常规稻A3、常规稻A4、常规稻6、常规稻B6、常规稻A8、常规稻B9
籼稻保持系	润丰B、吉丰B、五丰B	天丰B、恒丰B、高红B	泰丰B、荣丰B、安丰B、广泰B、粤禾B、谷丰B、五乡B
籼稻恢复系	闽恢3301、广恢998、广恢122、广恢428	广恢2213	广恢390、广恢3618、广恢321、广恢2213、恢529、辐恢838、广恢9918、昌恢121、蜀恢527、广恢981、R1128、广恢3550、明恢86、赣恢600、广恢7170 、C084
爪哇稻	Francis（CK1)	starbonett99、L-203、 CYBONNET	TronaiB
合计	12	19	46

类别	早季和晚季	仅供早季	仅供晚季
常规籼稻	合丰占、常规稻5（2015 晚造广东省区试收集常规稻中熟组5，下同）、五广占、粤禾丝苗	粤抗1614、广超1614、中早35、谷梅4号、广金占、新黄占、白粳占、黄丝莉占、粤抗1612、海稻86、新1613、kasalath(CK2)	玉晶软占、黄丝莉占、广粤占、新黄占、南八糯、南晶占、华粤软占、黄银占、粤油丝苗、合莉丝苗、象竹香丝苗、美香占2号、黄软秀占、五粤占2号、常规稻1、常规稻2、常规稻A3、常规稻A4、常规稻6、常规稻B6、常规稻A8、常规稻B9
籼稻保持系	润丰B、吉丰B、五丰B	天丰B、恒丰B、高红B	泰丰B、荣丰B、安丰B、广泰B、粤禾B、谷丰B、五乡B
籼稻恢复系	闽恢3301、广恢998、广恢122、广恢428	广恢2213	广恢390、广恢3618、广恢321、广恢2213、恢529、辐恢838、广恢9918、昌恢121、蜀恢527、广恢981、R1128、广恢3550、明恢86、赣恢600、广恢7170 、C084
爪哇稻	Francis（CK1)	starbonett99、L-203、 CYBONNET	TronaiB
合计	12	19	46

季别	平均值±标准差	最大值	最小值
早季	52.2±11.9	76.0	37.0
晚季	14.5±13.4^**	39.5	0.5

季别	平均值±标准差	最大值	最小值
早季	52.2±11.9	76.0	37.0
晚季	14.5±13.4^**	39.5	0.5