Do NERICA rice cultivars express resistance to Striga hermonthica (Del.) Benth. and Striga asiatica (L.) Kuntze under field conditions

摘要: The parasitic weeds Striga asiatica and hermonthica cause high yield losses in rain-fed upland rice Africa. Two resistance classes (pre- post-attachment) several resistant genotypes have been identified among NERICA (New Rice for Africa) cultivars under laboratory conditions (in vitro) previously. However, little is known about expression of this field conditions. Here we investigated (1) whether exhibited controlled would express representative Striga-infested conditions, (2) achieve relatively good grain yields Twenty-five cultivars, including all 18 were screened S. asiatica-infested Tanzania) hermonthica-infested Kenya) fields during two seasons. Additionally, a selection was tested vitro, mini-rhizotron systems. For the first time, observed confirmed NERICA-2, -5, -10 -17 (against asiatica) NERICA-1 to -10, -12, -13 hermonthica). Despite Striga-infestation levels, around 1.8 t ha−1 obtained with NERICA-1, -9 field) 1.4 NERICA-3, -4, -8, -12 field). In addition, potential levels tolerance (S. These findings are highly relevant agronomists breeders molecular geneticists working on resistance. combining broad-spectrum can be recommended farmers Striga-prone areas.