Variety traits
Helianthus annuus L.
A complex adaptive trait of sunflower that determines yield stability under moisture deficit due to morphophysiological mechanisms and biochemical regulation of metabolism.
In the reference 75 varieties crop Sunflower, where this is mentioned in the description.
The evaluation of sunflower tolerance is based on biochemical markers, such as the accumulation of free proline, where an index of 4.1 and above indicates high tolerance. Also taken into account are the ability of roots to penetrate deep soil horizons, the water-holding capacity of leaves due to cuticular waxes, and the preservation of cell membrane integrity during dehydration.
From an agronomic perspective, drought tolerance is expressed by a higher threshold for pollen sterilization during high temperatures at the flowering stage and the ability to rapidly recover assimilation after stress. The critical periods for the crop are flowering and seed filling, where moisture deficiency can reduce yield by half, making it effective to maintain a plant density of 45–55 thousand plants per hectare in arid zones.
General information about the subject — on the page Drought tolerance.
Selection based on the description text, not on official evaluation: these data are absent from registers. For specific variety details, please refer to its profile.
Helianthus annuus L. · Sunflower
RAGT 2N S.A.S
Helianthus annuus L. · Sunflower
RAGT 2N S.A.S
Helianthus annuus L. · Sunflower
Syngenta Participations AG
Helianthus annuus L. · Sunflower
Syngenta Crop Protection AG, CH
Helianthus annuus L. · Sunflower
SYNGENTA FRANCE S.A.S.
Helianthus annuus L. · Sunflower
SYNGENTA FRANCE S.A.S.
Helianthus annuus L. · Sunflower
RAGT 2N S.A.S
Helianthus annuus L. · Sunflower
PIONEER OVERSEAS CORPORATION US
Helianthus annuus L. · Sunflower
Verneuil Recherche (FR)
Helianthus annuus L. · Sunflower
Nidera S.A.
Helianthus annuus L. · Sunflower
Nicolae Boaghe, Elena Andreea Teodorescu
Helianthus annuus L. · Sunflower
Jean Pierre Dufourcq
Helianthus annuus L. · Sunflower
Tankszon Shandor, Medovarski Zoltan, Selumne Frank Zilvia, Au Zoltan, Duruhzne Oksko Edit, Nahin Katni Rozalia,
Helianthus annuus L. · Sunflower
Limagrain Europe SA (FR)
Helianthus annuus L. · Sunflower
KWS SAAT SE & CO.KGAA
Helianthus annuus L. · Sunflower
Ragt 2n, F
Helianthus annuus L. · Sunflower
NUSEED SERBIA
Helianthus annuus L. · Sunflower
Pablo Bergada
Helianthus annuus L. · Sunflower
PIONEER OVERSEAS CORPORATION
Helianthus annuus L. · Sunflower
Sadik
Helianthus annuus L. · Sunflower
PIONEER OVERSEAS CORPORATION
Helianthus annuus L. · Sunflower
Pioneer Overseas Cor, USA
Helianthus annuus L. · Sunflower
PANAM FRANCE SARL, FR
Helianthus annuus L. · Sunflower
Strube Research GmbH&Co KG