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• Selection of the promising homozygous glutinous thermo-sensitive genic sterile (waxy-TGMS) individuals from three segregating rice (Oryza sativa L.) populations

  Nguyen Tuan Anh, Nguyen Thi Bich Hong, Nguyen Quoc Trung, Nguyen Thi Hoa, Vu Ngoc Lan, Tran Thi Thanh Xuan, Vu Van Son, Nguyen Van Hai, Nguyen Thanh Tung, Tran Van Quang

  Received: Oct 21, 2025 / Accepted: Mar 06, 2026 / Published: Mar 31, 2026

   Abstract PDF

  The demand for glutinous rice for exporting encourages the breeding of new hybrid glutinous rice lines to meet the needed yield. Waxy-TGMS lines are principle materials to develop glutinous two-line hybrid rice, but have not been developed in Vietnam. This paper shows the selection of homozygous waxy-TGMS plants with advantageous agronomic traits from F2 segregating populations to develop promising waxy-TGMS breeding lines. More than 3000 individuals from three F2 populations derived from the crosses between non-waxy TGMS lines (tms5 gene donor) and glutinous rice varieties (wx gene donor) were screened to picked up only 10 homozygous waxy-TGMS plants (tms5/tms5 wx/wx) with desired agronomic characters. F3 seeds harvested from 10 desired F2 individuals all had low amylose content like their waxy male parent variety and could be used to develop further into ten waxy-TGMS breeding lines.

• Combining Ability Analysis for Quality Traits in Selected Rice Varieties (Oryza sativa L.)

  Nguyen Ba Thang

  Received: Mar 14, 2023 / Accepted: Aug 06, 2024 / Published: Sep 30, 2024

   Abstract PDF

  Fifteen hybrid combinations developed by crossing five lines and three testers were assessed for milling and physio-chemical qualities to evaluate the combining ability of the parents using a line x tester design. This investigation provided information about the general combining ability (GCA) of parents and the specific combining ability (SCA) effects of crosses from eight popular inbred varieties. C70 was considered the best general combiner for the head rice recovery trait, while the crosses involving C70 with DH18 and CR203, 13/2 with TBR225 and Xi23, and OM6976 with TBR45 showed significant positive specific combining ability (SCA) effects. Xi23 and OM6976 among the lines showed significant general combining ability (GCA) effects indicating them to be good general combiners for obtaining hybrids with desirable (low or intermediate) properties of amylose content. The variances due to SCA were of greater magnitude than GCA for all the traits, revealing the preponderance of non-additive gene action for all the studied attributes. In all the studied quality traits, the narrow sense heritabilities were ordered as follows: head rice recovery > amylose content > gel consistency > alkali digestion > hulling percentage > milling percentage. The narrow sense heritabilities in these traits were quite low, ranging from 8.11% to 14.4%. Among the eight parents, C70, Xi23, and TBR225 were the most ideal for high-quality line breeding.