Cell lineage patterns in the shoot meristem of the sunflower embryo in the dry seed

Journal Article · Sun Jan 01 00:00:00 EST 1989 · Dev. Biol.; (United States)

DOI:https://doi.org/10.1016/S0012-1606(89)80053-3· OSTI ID:6394542

Jegla, D E; Sussex, I M

We mapped the fate of cells in the shoot meristem of the dry-seed embryo of sunflower, Helianthus annuus L. cv. Peredovic, using irradiation-induced somatic sectors. We analyzed 249 chlorophyll-deficient or glabrous (hairless) sectors generated in 236 plants. Most sectors observed in the inflorescence extended into vegetative nodes. Thus cell lineages that ultimately gave rise to reproductive structures also contributed to vegetative structures. No single sector extended the entire length of the shoot. Thus the shoot is not derived from one or a few apical initials. Rather, the position, vertical extent, and width of the sectors at different levels of the shoot suggest that the shoot is derived from three to four circumferential populations of cells in each of three cell layers of the embryo meristem. Sectors had no common boundaries even in plants with two or three independent sectors, but varied in extent and overlapped along the length of the shoot. Thus individual cells in a single circumferential population behaved independently to contribute lineages of different vertical extents to the growing shoot. The predicted number of circumferential populations of cells as well as the apparent cell number in each population was consistent with the actual number of cells in the embryo meristem observed in histological sections.

• Research Organization: Yale Univ., New Haven, CT (USA)
• OSTI ID: 6394542
• Journal Information: Dev. Biol.; (United States), Vol. 131:1
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
MUTATIONS
RADIOINDUCTION
SUNFLOWERS
CELL DIFFERENTIATION
GENETIC RADIATION EFFECTS
IRRADIATION
MERISTEMS
SEEDS
BIOLOGICAL EFFECTS
BIOLOGICAL RADIATION EFFECTS
BODY
GENETIC EFFECTS
MAGNOLIOPHYTA
MAGNOLIOPSIDA
PLANT TISSUES
PLANTS
RADIATION EFFECTS
TISSUES
560140* - Radiation Effects on Plants