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• Determination of some Technical Factors for Cucumber F1Hybrid Gl1-2 Seed Production in Northern Delta and Midlands

  Le Thi Thu, Pham My Linh, Tran Thi Minh Hang

  Date Received: 06-03-2020 / Date Accepted: 11-06-2020

   Abstract PDF (VIETNAMESE)

  GL1-2 is a cucumber F1hybrid variety produced successfully by researchers of Fruit & Vegetable Research Institute and approved by Ministry of Agriculture & Rural Development in 2014. This variety possesses several desired characteristics: vigorous growth, good flowering and fruiting, high yield (50 - 60 tons/ha) both in spring-summer and winter seasons in Northern Delta and Midlands areas, good fruit quality, resistance to downy mildew and powdery mildew diseases. In order to develop the seed production process, increase yield and quality of F1hybrid GL1-2 seeds, we carried out the study on determination of optimum planting ratio of parental lines, pollination time and time to harvest fruits. Three experiments were arranged in a randomized complete block with seven treatments of experiment 1 (parental ratio), five treatments of experiment 2 (pollination time), five treatments of experiment 3 (fruit age) and three replications. The experiments were set up in Spring and Summer 2017 in two provinces Thai Nguyen and Ha Noi. Our results showed that optimum planting ratio of GL1-2 parental lines was 1/4, from 8 to 9amwas an optimum time to do hand-pollination, and optimum time to harvest hybrid fruits was from 30 to 35 days after pollination, giving the best F1seed yield and quality.

• Characterization and Selection of Self-Pollinated and Geitonogamy-Derived Avocado Trees with High Fruit Quality in Tien Giang Province

  Nguyen Thi Mai Hanh, Le Huu Hai, Thai Hoang Phuc

  Date Received: 08-07-2022 / Date Accepted: 04-08-2023

   Abstract PDF (VIETNAMESE)

  This research was conducted to identify avocado trees with high quality of fruit as a source ofbreeding new avocado species. The survey was performed on individual avocado tree which had capable of fruiting in Tien Giang. The selected avocado trees recorded flowering characteristics., ratio of flowers on the tree, described fruit characteristics., and analyzed fruit quality criteria. In this study, four individual avocado trees were selected, displaying a capable of self-pollination and cross-pollination with flowers on the same tree, denoted as Cai Lay 1, Cai Lay 2, Cai Lay 3 and Cho Gao. They were well adapted to the conditions in Tien Giang province, yielding 70-120kg of fruit per tree every year. On average, the percentage of self-pollinated flowers accounted for about 33.31%, the group of semi-pollinated flowers accounted for about 11.25% and group A/group B flowers (which could not pollinate) accounted for about 51.45%. Those trees possessed fruit pulp moisture (ranged from 72.6-79.9%), fruit hardness (ranged from 1.03-1.37N) and high brix elevation (ranged from 10.0-12.0%). Out of them, Cai Lay 1 avocado indicated a higher lipid content (20.5%) and protein content (3.08%) than the Booth avocado varieties of class I, avocado 034 grown in Da Lat and avocado 034 grown in Tien Giang.

• Ovary Slice Culture Technique for Embyro Rescue of Interspecific Crosses between Lilium longiflorum and L. brownii var. colchesteri

  Nguyen Thi Lam Hai, Hiroshi Okubo

  Date Received: 06-06-2025 / Date Published: 13-06-2025

   Abstract PDF (VIETNAMESE)

  Lilium brownii var. colchesteri (BRO) has an unique characteristic, i.e., the flower color changes from yellowish-cream to white during anthesis. For introducing this trait to cut flower production in Lilium, interspecific crosses of L. longiflorum (as seed parents) and BRO (as a pollen parent) were carried out. Capsules with unviable seeds were found in all crosses. To overcome the incongruity barrier, ovary slices excised from developing ovaries at 7 to 28 days after pollination (DAP) were cultured in a Murashige and Skoog medium supplemented with 40g·L-1 sucrose, 40g·L-1 D-mannitol and 2.5g·L-1 gellan gum under 24h illumination. The hybridity of germinated bulblets were confirmed before acclimatization by isozyme analysis. Hybrid plantlets were obtained from the crosses of L. longiflorum ‘LPI’ × BRO. After acclimatization and cultivation, 11 hybrid plants produced flowers changing from yellowish cream to white during anthesis as does the pollen parent. 

  DOI: https://doi.org/10.31817/tckhnnvn.2013.11.6.

• Study on Flowering, Pollinated Potential and Fertilization of Some Cultivars Thailand Adenium obesum

  Nguyen Hanh Hoa

  Date Received: 21-02-2012 / Date Accepted: 22-02-2012 / Date Published: 13-06-2025

   Abstract PDF (VIETNAMESE)

  The characteristics relative to flowering, pollination, fertilization of  some Thai Adenium obesum accessions were investigated at the Faculty of Agronomy, Hanoi University of Agriculture. The results showed that stamens and pistils mature at  48 hrs. and 72 hrs after anthesis, respectively. The pollen viability of different accessions was high, ranging from 90.1±3.9% to 95.7±0.7%. The fruit set of the cross combinations varied from 25 to 100%. The colour characteristics of hybrid fruits were regulated by the  parental species. The fruit color was maternally controlled. The germination rate of Adenium obesum crossed seeds reached from 64% to 90.5%, and 25% to 97.4% of seedlings were obtained.

  DOI: https://doi.org/10.31817/tckhnnvn.2012.10.2.

• EVALUATION OF PURPLE WAXY CORN LINES FOR HYBRID VARIETY DEVELOPMENT

  Vu Van Liet, Pham QuangTuan, Nguyen TheHung, Nguyen Viet Long, Nguyen ThiNguyetAnh

  Date Received: 01-12-2015 / Date Accepted: 20-03-2016 / Date Published: 12-06-2025

   Abstract PDF (VIETNAMESE)

  This study was carried out to evaluate and select superior purple waxy corn lines derived from self-pollination (S3to S6generation) with high grain yield, marketable fresh cob yield, anthocyanin content, good eating quality and desirable agronomical characteristics. These lines were extracted from exotic and domestic germplasm. Phenotypic data collected included growth and developmental characteristic, yield and yield components, marketablefresh cob yield, total anthocyanin content, eating quality, pericarp thickness, sugar content,tenderness and taste.. Eighteen purple waxy corn lines out of 45 lines were selected based on selection index computed from ideotype plant analysis with 12 traits. These lines had high anthocyanin content (22.4 to 260.10 µg/L), acceptable grain yield (2.0 to 3.5 t/ha) and marketable fresh cob yield (3.8 to 6.4 t/ha), good eating quality and suitable agronomical characteristics. These lines were recommended for further purple waxy corn inbred line and hybrid development.

  DOI: https://doi.org/10.31817/tckhnnvn.2016.14.3.