title: HbMyb1, a Myb transcription factor from Hevea brasiliensis, suppresses stress induced cell death in transgenic tobacco.
abstract: Tapping panel dryness (TPD) is a complex physiological syndrome found widely in rubber tree (Hevea brasiliensis) plantations that causes severe yield loss in natural rubber-producing countries. In an earlier study, we confirmed that there is a negative correlation between HbMyb1 expression and TPD severity. To further investigate the function of HbMyb1 in TPD, HbMyb1 was over-expressed in tobacco controlled by a CaMV 35S promoter. In transgenic plants expressing HbMyb1, cell death induced by UV-B irradiation, paraquat and the hypersensitive reaction to necrotrophic fungal infection (Botrytis cinerea) was suppressed with a close correlation between HbMyb1 protein levels and the extent of suppression. In addition the nuclear condensation and degradation were observed in laticifer cells of TPD trees, while the nucleus of laticifer cells of healthy trees was morphologically normal. On the basis of the results described above, we propose that HbMyb1 maybe suppress stress induced cell death in rubber trees.
authors.affiliation: Key laboratory of Tropical Biotechnology, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, 4# Xueyuan Rd., Haikou 571101, China. shqpeng@163.com
authors.forename: Shi-Qing
authors.initials: SQ
authors.lastname: Peng
authors.forename: Kun-Xin
authors.initials: KX
authors.lastname: Wu
authors.forename: Gui-Xiu
authors.initials: GX
authors.lastname: Huang
authors.forename: Shou-Cai
authors.initials: SC
authors.lastname: Chen
mesh_terms: D000222:Adaptation, Physiological / Q000235:genetics*; D020171:Botrytis; D016923:Cell Death / Q000235:genetics*; D002467:Cell Nucleus; D015870:Gene Expression; D017343:Genes, Plant; D028482:Hevea / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D010269:Paraquat; D010935:Plant Diseases / Q000235:genetics*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D030821:Plants, Genetically Modified; D012016:Reference Values; D013312:Stress, Physiological / Q000235:genetics*; D014026:Nicotiana / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014197:Trees; D014466:Ultraviolet Rays
chemical_list: D010940:Plant Proteins; D014157:Transcription Factors; D010269:Paraquat