DOI: 10.3724/SP.J.1006.2017.01527

Acta Agronomica Sinica (作物学报) 2017/43:10 PP.1527-1535

Effect of Root-shoot Interaction on Cotton Hypocotyl Anatomy by Using Grafting Technique under Premature Senescence Induced by Potassium Defi-ciency

Under potassium (K) deficiency, effect of root-shoot interaction on cotton leaf premature senescence includes shoot-dominated and root-dominated patterns. Indirect evidences from grafting study under K deficiency have suggested that scion hypocotyl of shoot-dominated pattern (CCRI41 and SCRC22 combination) may have the ability to synthesize, metabolize and/or radially transport cytokinin (CTK) and abscisic acid (ABA), while that of root-dominated pattern (CCRI41 and CCRI49 combination) mainly delivers CTK and ABA from roots. In the present study, we observed the anatomy of scion hypocotyls of both patterns under K deficiency (0.03 mmol L-1), and evaluated if it is associated with the flux of CTK and ABA in xylem. In terms of I type grafts (one scion grafted onto one rootstock) of shoot-dominated pattern, the anatomy of scion hypocotyl was clearly influenced by rootstocks, which is inconsistent with the fact that the delivery rate of CTK and ABA in scion xylem was mainly affected by shoot. For Y type grafts (two scions grafted onto one rootstock) of shoot-dominated pattern, the scion with greater CTK flux and lower ABA flux showed growth superiority as compared with its counterpart. However, the two processes referring to flux of phytohormone in scion xylem and scion growth likely occurred concomitantly but not causally. As the results of CTK and ABA flux in scion xylem, the anatomy of scion hypocotyls of root-dominated pattern was obviously altered by rootstock in I grafts. Nevertheless, they might be also concomitant processes rather than the relationship of cause and effect. Additionally, there were significant differences in anatomy between two different scions of Y grafts of root-dominated pattern, which was disagreement with the similar CTK and ABA flux in xylem of two scions. In conclusion, the scion hypocotyl anatomy of either shoot-or root-dominated pattern regarding cotton leaf premature senescence induced by K deficiency is independent of CTK and ABA flux in its xylem. In addition, the differences in scion hypocotyl anatomy between two cultivars in I graft type were inconsistent with those in Y graft type, which is possibly due to shoot-shoot interaction in Y graft.

Key words:Cotton,Grafts,Root-shoot interaction,Hypocotyl,Anatomy

ReleaseDate:2017-12-07 14:03:34

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