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Silk Elongation in Maize

Relationship with Flower Development and Pollination

^a Dep. de Producción Vegetal, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, Buenos Aires (C1417DSE), Argentina
^b INRA– Unité Environnement et Grandes Cultures, 78850 Thiverval Grignon, France

View larger version (27K): [in a new window]   Fig. 1. Apical ear length as a function of thermal time from apical ear differentiation in hybrids DK696 (Argentina) and DEA (France). Thermal time was calculated using a base temperature of 9.7°C. Arrows indicate silking.

View larger version (20K): [in a new window]   Fig. 2. Number of initiated spikelets, visible initiated silks and emerged silks as a function of thermal time from apical ear differentiation in hybrids DEA and DK696.

View larger version (23K): [in a new window]   Fig. 3. Silk length as a function of thermal time from silking for open-pollinated ears in DEA and DK696 and for non-pollinated ears in DK696. Values and arrows indicate thermal time at a commonly silk length measure ( 0.02 cm) for selected spikelet positions (Sn).

View larger version (20K): [in a new window]   Fig. 4. Silk elongation pattern for three (hybrid DEA) and four (hybrid DK696) selected spikelet positions (Sn). Values and arrows indicate thermal time (TT) at silk emergence from the husks for each Sn. Solid lines represent fitted exponential and linear models. Data correspond to open-pollinated ears in DEA and bagged-ears in DK696.

View larger version (20K): [in a new window]   Fig. 5. Relationship between spikelet and silk length for different spikelet positions along the ears of hybrid DEA. Sections 1, 2 and 3 correspond to flowers 1-10, 11-20 and 21-30 from the base to the tip of the ear, respectively. Solid lines indicate the fitted linear models.