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Flower Abortion Caused by Preanthesis Water Deficit Is Not Attributed to Impairment of Pollen in Soybean

^a Graduate School of Agricultural Science, Tohoku Univ., Aoba-ku, Sendai, 981-8555, Japan
^b Tohoku National Agric. Exp. Stn., Kariwano, Akita, 019-2112, Japan
^c National Agriculture Research Center, Kannondai, Tsukuba, 305-8666, Japan

View larger version (15K): [in a new window]   Fig. 1. Pod-set percentage of different positions on a raceme of well-watered plants. Soybean plants (IX93-100) were grown in pots in a controlled environment chamber (30/20°C day/night temperature, 15-h photoperiod). Each point represents the mean ± SE of 30 racemes.

View larger version (26K): [in a new window]   Fig. 2. Pod-set percentage at proximal positions (1–4) on racemes of self-pollinated flowers from well-watered and water-deficient plants, as a function of time of water restriction, expressed as days after flowering. Each point represents the mean ± SE of 30 racemes.

View larger version (30K): [in a new window]   Fig. 3. Effect of water restriction on water potentials of leaves and flowers in soybeans. WL, Well-watered leaf; WF, Well-watered flower; DL, Water-deficient leaf; DF, Water-deficient flower. Each point represents the mean ± SE of five plants.

View larger version (27K): [in a new window]   Fig. 4. Pod-set percentage of hand pollinated flowers at proximal positions (1–4) on racemes. Reciprocal crosses were made between well-watered (WW) and water-deficient (WD) soybean plants (IX93-100). Each point represents the mean ± SE of 20 racemes.