title: [Difference of potassium absorption characters and mechanism of tobacco in genotypes].
abstract: Tabacco (Nicotiana tabacum) has a relatively high requirement for potassium (K). The difference in root characteristics and ability to release K from minerals of flue-cured tobacco in four genotypes ND202, NC628, G28 and NC628 x ND202 were analyzed. The results showed that the more available K released from minerals by roots, the more K would be accumulated by plants. ND202, which was K-enriched genotype, had well developed root system and was easily influenced by K content in the environment. Compared with ND202, NC628 significantly enhanced the effectiveness of K in substrate by releasing K from minerals, though the ability to absorb K was weak. Moreover, the hybrid of NC628 x ND202 had a higher ability to release K and to tolerate low-level K than maternal parent. It was higher in dry matter accumulation and K enrichment than male parent. So hybridization had the utility value in high-K variety cultivation. These results provided evidence that parents should have the ability to enhance available K from soil besides the high combining ability for breeding the high-K variety.
authors.forename: Bing
authors.initials: B
authors.lastname: He
authors.forename: Zhu-jun
authors.initials: ZJ
authors.lastname: Han
authors.forename: Gang
authors.initials: G
authors.lastname: Xue
authors.forename: Xue-xia
authors.initials: XX
authors.lastname: Xing
authors.forename: Xiao-jing
authors.initials: XJ
authors.lastname: Xu
authors.forename: Shi-xiao
authors.initials: SX
authors.lastname: Xu
authors.forename: Xiao-quan
authors.initials: XQ
authors.lastname: Zhang
authors.forename: Tie-zhao
authors.initials: TZ
authors.lastname: Yang
mesh_terms: D005838:Genotype; D018517:Plant Roots / Q000378:metabolism*; D011188:Potassium / Q000378:metabolism*; D012987:Soil / Q000737:chemistry; D014026:Nicotiana / Q000235:genetics / Q000378:metabolism*
chemical_list: D012987:Soil; D011188:Potassium