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Cha-um, Suriyan,Vejchasarn, Phanchita,Kirdmanee, Chalermpol The Korean Society of Crop Science 2007 Journal of crop science and biotechnology Vol.10 No.4
Rice is one of the world's staple crops and is a major source of carbohydrate. Rice is exported from several countries, providing a major source of income. There are many documents reporting that rice is a salt-sensitive crop in its developmental stages. The objective of this investigation is to evaluate the effective salt-tolerance defense mechanisms in aromatic rice varieties. Pathumthani 1(PT1), Jasmine(KDML105), and Homjan(HJ) aromatic rice varieties were chosen as plant materials. Rice seedlings photoautotrophically grown in-vitro were treated with 0, 85, 171, 256, 342, and 427 mM NaCl in the media. Data, including sodium ion$(Na^+)$ and potassium ion$(K^+)$ accumulation, osmolarity, chlorophyll pigment concentration, and the fresh and dry weights of seedlings were collected after salt-treatment for 5 days. $Na^+$ in salt-stressed seedlings gradually accumulated, while $K^+$ decreased, especially in the 342-427 mM NaCl salt treatments. The $Na^+$ accumulation in both salt-stressed root and leaf tissues was positively related to osmolarity, leading to chlorophyll degradation. In the case of the different rice varieties, the results showed that the HJ variety was identified as being salt-tolerant, maintaining root and shoot osmolarities as well as pigment stabilization when exposed to salt stress or $Na^+$ enrichment in the cells. On the other hand, PT1 and KDML105 varieties were classified as salt-sensitive, determined by chlorophyll degradation using Hierarchical cluster analysis. In conclusion, the HJ-salt tolerant variety should be further utilized as a parental line or genetic resource in breeding programs because of the osmoregulation defensive response to salt-stress.
Suriyan Cha-um,Phanchita Vejchasarn,Chalermpol Kirdmanee 한국작물학회 2007 Journal of crop science and biotechnology Vol.10 No.4
Rice is one of the world's staple crops and is a major source of carbohydrate. Rice is exported from several countries, providing a major source of income. There are many documents reporting that rice is a salt-sensitive crop in its developmental stages. The objective of this investigation is to evaluate the effective salt-tolerance defense mechanisms in aromatic rice varieties. Pathumthani 1 (PT1), Jasmine (KDML105), and Homjan (HJ) aromatic rice varieties were chosen as plant materials. Rice seedlings photoautotrophically grown in-vitro were treated with 0, 85, 171, 256, 342, and 427 mM NaCl in the media. Data, including sodium ion (Na+) and potassium ion (K+) accumulation, osmolarity, chlorophyll pigment concentration, and the fresh and dry weights of seedlings were collected after salt-treatment for 5 days. Na+ in salt-stressed seedlings gradually accumulated, while K+ decreased, especially in the 342-427 mM NaCl salt treatments. The Na+ accumulation in both salt-stressed root and leaf tissues was positively related to osmolarity, leading to chlorophyll degradation. In the case of the different rice varieties, the results showed that the HJ variety was identified as being salt-tolerant, maintaining root and shoot osmolarities as well as pigment stabilization when exposed to salt stress or Na+ enrichment in the cells. On the other hand, PT1 and KDML105 varieties were classified as salt-sensitive, determined by chlorophyll degradation using Hierarchical cluster analysis. In conclusion, the HJ-salt tolerant variety should be further utilized as a parental line or genetic resource in breeding programs because of the osmoregulation defensive response to salt-stress. Rice is one of the world's staple crops and is a major source of carbohydrate. Rice is exported from several countries, providing a major source of income. There are many documents reporting that rice is a salt-sensitive crop in its developmental stages. The objective of this investigation is to evaluate the effective salt-tolerance defense mechanisms in aromatic rice varieties. Pathumthani 1 (PT1), Jasmine (KDML105), and Homjan (HJ) aromatic rice varieties were chosen as plant materials. Rice seedlings photoautotrophically grown in-vitro were treated with 0, 85, 171, 256, 342, and 427 mM NaCl in the media. Data, including sodium ion (Na+) and potassium ion (K+) accumulation, osmolarity, chlorophyll pigment concentration, and the fresh and dry weights of seedlings were collected after salt-treatment for 5 days. Na+ in salt-stressed seedlings gradually accumulated, while K+ decreased, especially in the 342-427 mM NaCl salt treatments. The Na+ accumulation in both salt-stressed root and leaf tissues was positively related to osmolarity, leading to chlorophyll degradation. In the case of the different rice varieties, the results showed that the HJ variety was identified as being salt-tolerant, maintaining root and shoot osmolarities as well as pigment stabilization when exposed to salt stress or Na+ enrichment in the cells. On the other hand, PT1 and KDML105 varieties were classified as salt-sensitive, determined by chlorophyll degradation using Hierarchical cluster analysis. In conclusion, the HJ-salt tolerant variety should be further utilized as a parental line or genetic resource in breeding programs because of the osmoregulation defensive response to salt-stress.
Kanokwan Romyanon,Kamolmanus Watana,Aussanee Pichakum,Kriengkrai Mosaleeyanon,Chalermpol Kirdmanee 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.6
Clonally propagating elite lines of oil palm via multiple shoot organogenesis is promising due to geneticstability of regenerants. In this study, we tested the effects of medium composition using three basal media types(Murashige and Skoog (MS), woody plant medium (WPM), and Y3) with concentrations of sucrose and differentionic strengths derived from sucrose, sorbitol, or both sucrose and sorbitol on the growth and development of oilpalm plantlets derived from direct-shoot organogenesis and zygotic embryo-derived seedlings (control). We usedhistological assays to better understand the medium formulation’s efficiency for shoot organogenesis. The shootinduction percentage was the highest when plantlets were cultured on ½ MS medium supplemented with 5% sucrose. A minimum osmotic potential of -2.0 MPa is essential to efficiently drive shoot maturation of oil palm. Sorbitolappeared to be less effective than sucrose for shoot formation of oil palms. To determine the rate of somoclonalchanges between these two micropropagation methods, we investigated the rate of DNA methylation in oil palmplantlets using the methylation-sensitive amplification polymorphism (MSAP) technique. Our MSAP results showed thatpolymorphisms between in vitro seedling-derived plantlets and direct-shoot organogenesis-derived plantlets wereconsiderably low. We conclude that regenerated plantlets derived from this established protocol are reliable for trueto-type propagation of elite oil palm clones.