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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Mechanism of phytohormone involvement in feedback regulation of cotton leaf senescence induced by potassium deficiency
Journal of Experimental Botany, Volume 63, No. 16, Year 2012
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Description
To elucidate the phytohormonal basis of the feedback regulation of leaf senescence induced by potassium (K) deficiency in cotton (Gossypium hirsutum L.), two cultivars contrasting in sensitivity to K deficiency were self- and reciprocally grafted hypocotyl-to-hypocotyl, using standard grafting (one scion grafted onto one rootstock), Y grafting (two scions grafted onto one rootstock), and inverted Y grafting (one scion grafted onto two rootstocks) at the seedling stage. K deficiency (0.03mM for standard and Y grafting, and 0.01mM for inverted Y grafting) increased the root abscisic acid (ABA) concentration by 1.6- to 3.1-fold and xylem ABA delivery rates by 1.8- to 4.6-fold. The K deficiency also decreased the delivery rates of xylem cytokinins [CKs; including the zeatin riboside (ZR) and isopentenyl adenosine (iPA) type] by 29-65% and leaf CK concentration by 16-57%. The leaf ABA concentration and xylem ABA deliveries were consistently greater in CCRI41 (more sensitive to K deficiency) than in SCRC22 (less sensitive to K deficiency) scions under K deficiency, and ZR- and iPA-type levels were consistently lower in the former than in the latter, irrespective of rootstock cultivar or grafting type, indicating that cotton shoot influences the levels of ABA and CKs in leaves and xylem sap. Because the scions had little influence on phytohormone levels in the roots (rootstocks) of all three types of grafts and rootstock xylem sap (collected below the graft union) of Y and inverted Y grafts, it appears that the site for basipetal feedback signal(s) involved in the regulation of xylem phytohormones is the hypocotyl of cotton seedlings. Also, the target of this feedback signal(s) is more likely to be the changes in xylem phytohormones within tissues of the hypocotyl rather than the export of phytohormones from the roots. © 2012 The Author(s).
Authors & Co-Authors
Wang, Ye
China, Beijing
China Agricultural University
Li, Bo
China, Beijing
China Agricultural University
China
Shandong Kingenta Ecological Engineering Co., Ltd.
Du, Mingwei
China, Beijing
China Agricultural University
Eneji, Anthony Egrinya
Nigeria, Calabar
University of Calabar
Wang, Baomin Ming
China, Beijing
China Agricultural University
Duan, Liusheng
China, Beijing
China Agricultural University
Li, Zhaohu
China, Beijing
China Agricultural University
Tian, Xiaoli Lei
China, Beijing
China Agricultural University
Statistics
Citations: 243
Authors: 8
Affiliations: 3
Identifiers
Doi:
10.1093/jxb/ers238
ISSN:
00220957
e-ISSN:
14602431
Study Approach
Qualitative