Better crops require healthy, plump seeds. While the seed’s source does not affect the crop’s tolerance to stress, such as drought and salinity, it can improve yields under favourable growing conditions. Seed from saline soils should be avoided in non-saline soils as yield penalties may carry over into several successive crops.
- Measure increases in wheat yield achieved by better matching the source of seed with its growing, or ‘target’, environment.
- Identify changes in seed composition and gene regulation that explain pre-adaptation to stress.
- Provide guidelines for growers to help them improve crop yield by matching seed source to its target environment.
In The Field
Chamber and field experiments were used in this project.
In the chamber, wheat varieties KRL19 and Krichauff were grown under saline or control conditions during four successive generations.
In the field, commercial wheat varieties Axe, Emu Rock, Wyalkatchem and Gladius were grown at six South Australian sites (Cummins, Minnipa, Palmer, Pinnaroo, Streaky Bay and Turretfield) in 2011 and 2012. These sites were the ‘maternal’ environments, with a further three sites – at Minnipa, Pinnaroo and Turretfield – providing the ‘target’ environments. Seed from the maternal environments was used as the source seed for the trials grown in 2012 and 2013 at the target environments.
Rainfall across the sites ranged from 157 to 397 millimetres in the growing season. Soils were slightly alkaline and varied in texture from sandy loam to clay. Yields at the target environments ranged from 2.1t/ha in 2012 to 3t/ha in 2013.
All crops were sown, managed and harvested using National Variety Trial protocols.
Wheat yield increases by matching seed source to
The seed source was found to have no effect on the mean yield or the yield of a crop under stressful conditions. However, there was a large and consistent effect on crop yield under favourable conditions.
In 2012, the effect on yield of the source of the seed ranged from undetectable in Gladius to 30% in Wyalkatchem. In 2013, the effect on yield was similar for all varieties, ranging from 15% to 18%.
Pre-adaptation to stress
Contrary to expectation, the source of the seed did not improve stress adaptation in the field, but it did dramatically change the responsiveness to favourable growing conditions – above 2.5t/ha.
Due to the complex interaction between the environment where the seed was sourced, the variety and target environment, it was difficult to identify specific traits, such as protein, thousand grain weight and screenings, which could be targeted to predict which seed source would provide the higher yield.
This project reinforced the message that better crops require healthy, plump seed and the potential benefits of matching the seed’s source to a target environment’s soil condition where possible.
SARDI: Victor Sadras, Rob Wheeler, Klaus Oldach
University of Adelaide: Julian Taylor, Tim March.
Source of seed is thought to affect crop performance by impacting on crop yield and stress tolerance.
SARDI researched various ways in which cereal production could be improved by matching the source of seed to the environment in which they are to be grown.
Associate Professor Victor Sadras, Principal Scientist, Crop Ecophysiology, SARDI
T: 08 8303 9661
E: [email protected]
Value for Growers
- The source of seed used to grow a crop can have a large impact on yield.
- Depending on the variety and cropping conditions, the source of the seed can generate variation in yield from small (8%) to large (30%).
- Variations in yield with seed source are more likely to show under favourable conditions – where yields will be higher than 2.5t/ha – than under stress.
- Seed from crops raised on saline soil might result in a decreased yield in non-saline soils. This effect may last for several seasons.
- Select healthy, plump seed and try to avoid seed from saline soils as a precaution for hidden yield penalties.