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Fig. 1. Ear development at maturity and ovary starch at pollination in maize subjected to low w for a few days around the time of pollination. Mature ears: (A) Controls from plants at high w, showing about 495±10 kernels per ear (SE for 9–11 ears). (B) Ears from plants at low w around the time of pollination, but having sucrose infused into the stems. These show about 340±15 kernels per ear. (C) Ears from plants at low w, producing 15±3 kernels per ear. Ears are somewhat crooked because ovaries were sampled in mid-ear around the time of pollination, which caused slight deformation at maturity. Sampled areas are on back of ear and not visible. For these experiments, w had decreased to about –1.45 MPa by the day of pollination, and net photosynthesis was near zero. The plants were rewatered 1 d later and kept hydrated until maturity (JE McLaughlin and JS Boyer, unpublished data). Ovary starch on the day of pollination: (D) Control ovary from plant at high w. Starch (region staining black) is located in the basal pedicel tissues around the phloem termini and in the ovary wall around the nucellus. There is no starch in the nucellus. Silk normally attached to the ovary apex has been removed. (E) Ovary from plant at low w around the time of pollination but having sucrose infused into the stems. Note that starch is present in the same location as in (D) but in lesser amount. (F) Ovary from plant at low w. Starch has nearly disappeared from pedicel and ovary wall. Bar indicates 1 mm. (Chemical analyses and detailed images are available in Zinselmeier et al., 1999, from which the starch images were adapted. ©American Society of Plant Biologists. Reprinted with permission.)
Fig. 2. Diagrammatic changes in ovary constituents with time, expressed on a whole ovary basis. By comparing contents before and after treatments are imposed, the change (slope) gives information about fluxes to the ovary. Upward slope indicates that production of the constituent (influx) exceeds use (efflux). Downward slope indicates production was less than use. Zero slope indicates that production equalled use. See text for further details.
Source: Journal of Experimental Botany 2004 55(407):2385-2394
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