HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (34) Citing Articles via Google Scholar Google Scholar Articles by Setter, T. L. Articles by Melkonian, J. Search for Related Content PubMed Articles by Setter, T. L. Articles by Melkonian, J. Agricola Articles by Setter, T. L. Articles by Melkonian, J. Related Collections Crop Growth and Development Water Stress Crop Physiology & Metabolism

Loss of Kernel Set Due to Water Deficit and Shade in Maize

Carbohydrate Supplies, Abscisic Acid, and Cytokinins

Dep. of Crop and Soil Sciences, Cornell Univ., 521 Bradfield Hall, Ithaca, NY 14853

View larger version (30K): [in a new window]   Fig. 1. Mature kernel size and number in maize plants subjected to 5-d water deficit treatments during pre-pollination and post-pollination stages in Exp. I. (a): Kernel dry matter yield per plant, (b): kernel number per ear, (c): average kernel size for all kernels on an ear (left) and in apical regions of ears at the 35th and 40th nodal rings, counting from the base of each ear. Averages ± SEM of seven replicates are shown.

View larger version (32K): [in a new window]   Fig. 2. Carbohydrate concentrations per gram FW in tissues sampled from the apical ear region of plants subjected to control and 5-d water deficit treatments during pre-pollination (upper panels) and post-pollination (lower panels) stages in Exp. I. Means ± SEM of seven replicates are shown.

View larger version (27K): [in a new window]   Fig. 3. Abscisic acid concentrations in per gram FW in tissues sampled from the apical ear region of plants subjected to control and 5-d water deficit treatments during pre-pollination (left) and post-pollination (right) stages in Exp. I. Means ± SEM of seven replicates are shown.

View larger version (37K): [in a new window]   Fig. 4 Leaf gas exchange of plants subjected to control (•), shade () and water deficit () treatments during pre-pollination (upper panels) or post-pollination (lower panels) developmental stages in Exp. II. Net photosynthetic CO2 exchange rate (Pn; left panels) and stomatal CO2 conductance (gs; right panels) of 3 to 5 replicates (mean ± SEM) are shown. Data are plotted with respect to the days from treatment termination (DFTT). On the days of treatment termination (0 DFTT), plants were re-watered or removed from shade at 0800 and gas exchange data was acquired at 1100 to 1400 h.

View larger version (48K): [in a new window]   Fig. 5. Carbohydrate concentrations in florets (upper panels) and vascular cobs (lower panels) of plants subjected to control, shade, and water deficit treatments during the pre-pollination stage in Exp. II. Tissues were sampled from apical and basal regions of ears at the conclusion of treatments. Means ± SEM of 10 replicates are shown.

View larger version (50K): [in a new window]   Fig. 6. Carbohydrate concentrations in endosperm/nucellus composite tissues (upper panel) and pedicels (lower panels) of plants subjected to control, shade, and water deficit treatments during the post-pollination stage in Exp. II. Tissues were sampled from apical and basal regions of ears at the conclusion of treatments, 7 d after pollination. Means ± SEM of 10 replicates are shown.

View larger version (35K): [in a new window]   Fig. 7. Total nonstructural carbohydrate accumulation during 5-d shade and water deficit treatments in florets sampled at the pre-pollination stage (a) and composite endosperm/nucellus tissues sampled at the post-pollination stage (b). Nonstructural carbohydrates was calculated as the change during the 5-d stress period of the sum of glucose, fructose, sucrose, and starch in tissues.

View larger version (36K): [in a new window]   Fig. 8. Abscisic acid concentrations in florets (a), vascular cobs (b), endosperm/nucellus composite tissues (c) and pedicels (d) of plants subjected to control, shade, and water deficit treatments during the pre-pollination stage (upper panels) and post-pollination stage (lower panels) in Exp. II. Tissues were sampled from apical and basal regions of ears at the conclusion of treatments. Means ± SEM of 10 replicates are shown.

View larger version (34K): [in a new window]   Fig. 9. Total zeatin-like cytokinin concentrations in florets (a), vascular cobs (b), endosperm/nucellus (c) and pedicels (d) of plants subjected to control, shade, and water deficit treatments during the pre-pollination stage (upper panels) or post-pollination stage (lower panels) in Exp. II. Means ± SEM of 10 replicates are shown.