Pod development and depodding produce parallel effects on xylem sap cytokinin levels and monocarpic leaf senescence in soybean

Journal Article · Sat Apr 01 00:00:00 EST 1989 · Plant Physiology, Supplement; (USA)

OSTI ID:6610887

Nooden, L D ^[1]; Singh, S; Letham, D S ^[2]

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1. Univ. of Michigan, Ann Arbor (USA)
2. Australia National Univ., Canberra (Australia)

Depodding at full pod extension (prepodfill) prevents the rapid leaf yellowing and death of the soybean plant, whereas pod removal in late podfill does not. Xylem sap was collected from rootstocks under pressure over 50 min, and after purification, the sap CKS were measured by radioimmunoassay. The major CKs (DZR, ZR, DZ and Z) drop from 229 nM to 15 during pod extension. Removal of pods reaching full extension causes a large increase in DZR and ZR levels, less increase in Z and no increase in DZ, DZMP or the O-glucosides. Depodding at the late podfill does not increase the CKs significantly. CKs change independently in response to senescence and pod removal suggesting differences in their metabolism and perhaps their functions. A decline in CK production by the roots and in CK flux into the shoot system appears to be an important factor in monocarpic senescence of soybean.

• OSTI ID: 6610887
• Journal Information: Plant Physiology, Supplement; (USA), Vol. 89:4; ISSN 0079-2241
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
KININS
BIOSYNTHESIS
LEAVES
CELL DIFFERENTIATION
GLYCINE HISPIDA
METABOLISM
RADIOIMMUNOASSAY
BIOASSAY
DIAGNOSTIC TECHNIQUES
IMMUNOASSAY
IMMUNOLOGY
ISOTOPE APPLICATIONS
LEGUMINOSAE
MAGNOLIOPHYTA
MAGNOLIOPSIDA
ORGANIC COMPOUNDS
PEPTIDES
PLANTS
POLYPEPTIDES
PROTEINS
RADIOASSAY
RADIOIMMUNODETECTION
RADIOIMMUNOLOGY
SYNTHESIS
TRACER TECHNIQUES
550201* - Biochemistry- Tracer Techniques