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
PIONEER OVERSEAS CORPORATION
Helianthus annuus L. · Sunflower
Dusanic Nenad, Miklik Vladimir, Gvozdenovic Sandra, Jocic Sinisa,
Helianthus annuus L. · Sunflower
MAS SEEDS
Helianthus annuus L. · Sunflower
ORSEM HYBRIDES
Helianthus annuus L. · Sunflower
Nickerson SA (FR)
Helianthus annuus L. · Sunflower
LIMAGRAIN EUROPE S.A.
Helianthus annuus L. · Sunflower
PANAM FRANCE SARL
Helianthus annuus L. · Sunflower
Helianthus annuus L. · Sunflower
Institute of Field & Vegetable Crops (RS)
Helianthus annuus L. · Sunflower
Institute of Field & Vegetable Crops (RS)
Helianthus annuus L. · Sunflower
MEUNIER JOEL
Helianthus annuus L. · Sunflower
Tahir Gucer, Ibrahim Yilmaz, Veli Pekcan, Yalcin Kaya, Goksel Evci,
Helianthus annuus L. · Sunflower
Maisadour Semences, FR
Helianthus annuus L. · Sunflower
Helianthus annuus L. · Sunflower
Helianthus annuus L. · Sunflower
SEMILLAS BATLLE S.A.
Helianthus annuus L. · Sunflower
S.D.M.E. SOCIETE DE MAIS EUROPEENS - STAZIONE SPERIMENTALE KWS
Helianthus annuus L. · Sunflower
MAS SEEDS
Helianthus annuus L. · Sunflower
Monsanto Technology LLC, US
Helianthus annuus L. · Sunflower
RAGT 2n, FR
Helianthus annuus L. · Sunflower
SINISA JOCIC / SANDRA CVEJIC / GORAN MALIDZA / VLADIMIR MIKLIC / NENAD DUSANIC / DRAGANA MILADINOVIC
Helianthus annuus L. · Sunflower
MAS SEEDS
Helianthus annuus L. · Sunflower
PETRAN ALEXANDRU VIORELDRAGHIA VIOLETA CONSTANTAOPROI ADRIANA CRISTINA
Helianthus annuus L. · Sunflower
LIMAGRAIN EUROPE S.A.