Source–sink relations and kernel weight differences in maize temperate hybrids

By B. Gambin, L. Borrás, M. E. Otegui. 2006

177 citations recorded by the source corpus.

Abstract Maize ( Zea mays L.) kernel weight (KW) response to changes in assimilate availability per kernel during grain filling suggests that plants establish an early kernel sink potential that place them to grow close to a saturating assimilate availability condition during late grain-filling, meaning source limitations are common only early in kernel development. As maize reproductive efficiency in kernel set is not constant across different plant growth rates (PGR) around flowering, we used PGR per kernel during this period as an indicator of source availability per kernel. We tested whether PGR per kernel during flowering or during the effective grain-filling period were correlated to genotypic and environmental differences in final KW. Plant growth rate during both periods, KW, kernel growth rate during the effective grain-filling period, total duration of grain filling and kernel number per plant were measured in 12 commercial genotypes differing in KW sown at two sites under full irrigation. As expected from the curvilinear response relating kernel number per plant and PGR around flowering, increased PGRs resulted in higher PGR per kernel around this period ( r 2  = 0.86; p r 2  = 0.40; p p p r 2  = 0.66; p r 2  = 0.27; p

Subfields: Agronomy and Crop Science, Plant Science

View Paper: https://www.semanticscholar.org/paper/b262eba37c83dac30ba2270f22568b9a4261eaf4

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In Agronomy and Crop Science

1. M. E. Otegui
2. G. Maddonni
3. A. Cirilo
4. J. R. Edreira
5. R. A. Fischer
6. L. Mayer
7. L. Borrás
8. B. Gambin

In Plant Science

1. M. E. Otegui
2. G. Maddonni
3. A. Cirilo
4. R. A. Fischer
5. L. Mayer
6. J. R. Edreira
7. L. Borrás
8. B. Gambin

Citations in the corpus

• Row Width and Maize Grain Yield (2006, background): “…classified as small (DK696, DK757 and Exp980) and large (AX882 and AX889) kernel weight hybrids, based on actual kernel weight (,300 m per kernel and .300 mg kernel 21 for small and large kernel weight, respectively ) at commercial plant densities (Gambín et al., 2006; Maddonni and Otegui, 2006).”
• Survey of Plant Density Tolerance in U.S. Maize Germplasm (2014, background): “Typically as plant density increases, plant growth rate during reproductive stages may become reduced (Echarte et al., 2000; Gambin et al., 2006; Rossini et al., 2011), leading to delayed pollen shed and silking (Tokatlidis and Koutroubas, 2004).”
• Resource distribution and the trade-off between seed number and seed weight: a comparison across crop species (2010, background): “The crop developmental phase when this potential individual seed weight is established is known to overlap with the seed determination period to different degrees depending on the particular species (Ney et al., 1993; Calderini et al., 2001; Gambı́n et al., 2006; Lindström et al., 2006; Yang et al.,”
• Heat stress in temperate and tropical maize hybrids: Kernel growth, water relations and assimilate availability for grain filling (2014, background): “…critical period for kernel set (ca. 30 d around silking; Fischer and Palmer, 1984; Grant et al., 1989; Kiniry and Ritchie, 1985) has been considered a good estimator of such source-sink ratio, which is highly correlated with both kernel growth rate and potential kernel weight (Gambín et al., 2006).”
• PAPER PRESENTED AT INTERNATIONAL WORKSHOP ON INCREASING WHEAT YIELD POTENTIAL, CIMMYT, OBREGON, MEXICO, 20–24 MARCH 2006 Understanding the physiological basis of yield potential in wheat (2007, background): “Recent results from maize also show genetic variation in PKW to be related to assimilate flux per kernel around flowering (Gambin et al. 2006).”