Digitaria sanguinalis (L.) Scop maternal effects on seed dormancy under environmental variations imposed by crop canopy
Fernando H. Oreja
A * and Elba B. de la Fuente A
+ Author Affiliations
- Author Affiliations
A Department of Vegetal Production, Faculty of Agronomy, University of Buenos Aires, Avenue San Martín 4453, C1417DSE Buenos Aires, Argentina.
Crop & Pasture Science 73(11) 1318-1324 https://doi.org/10.1071/CP22052
Submitted: 11 February 2022 Accepted: 21 April 2022 Published: 1 July 2022
© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing
Abstract
Context: Different environmental factors occurring during seed development could be responsible for maternal effects on seed dormancy. Understanding these effects on Digitaria sanguinalis (L.) Scop seeds would help to predict it’s seedling emergence.
Aims: To study D. sanguinalis maternal effects on seed dormancy level under environmental variations imposed by soybean (Glycine max L.) crop, changing (1) nutrient availability, (2) radiation and (3) soybean canopy presence during different phenological stages of the weed.
Methods: Field plots experiments under semi-controlled conditions were established to reach these objectives.
Key results: Among different factors evaluated, radiation was the most important factor, mainly during the reproductive stages of the weed. The reduction in solar radiation received by the mother plant diminished seed dormancy level even in those panicles receiving full sunlight in shaded plants.
Conclusions: Results suggest that solar radiation and temperature operate together in the mother plants to modify seed dormancy level.
Implications: Crop management decisions such as long crop cycles, late sowing date and narrow inter-row distances would reduce seed dormancy level and would anticipate a concentrated seedling emergence of the weed.
Keywords: canopy environmental factors, large crabgrass, seed dormancy, seedling emergence timing, solar radiation, soybean crop, weed management, maternal effects, grasses, temperature.
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