Titre du document / Document title

Cultural conditions contributing to vine decline syndrome in watermelon

Auteur(s) / Author(s)

MAKAM Srinivas N. ⁽¹⁾ ; PEER Wendy Ann ⁽¹⁾ ; BLAKESLEE Joshua J. ⁽¹⁾ ; MURPHY Angus S. ⁽¹⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Department of Horticulture and Landscape Architecture, Purdue University, Horticulture Building, 625 Agriculture Mall Drive, West Lafayette, IN 47907-0391, ETATS-UNIS

Résumé / Abstract

Since the mid-1980s, a syndrome known as mature watermelon vine decline (MWVD) has had a serious effect on watermelon (Citrullus lanatus Thunb.) crops in Southern Indiana. As efforts to identify a pathogen responsible for MWVD have been unsuccessful, we have examined cultural conditions that might contribute to the syndrome. Field conditions were simulated in greenhouse pot trials to assess the impact of one or more factors on watermelon growth. Alone, low organic matter, soil acidity, black plastic mulch, and liming did not significantly affect root fresh weight; however, when these conditions were combined, root fresh weight was significantly reduced. Alanap-treated watermelons in combination with simulated cultural conditions resulted in further reduction of root fresh weight and had symptoms similar to MWVD. Watermelon plants grown in Alanap-treated, aged soil (from the previous year's experiments) under combined deficient cultural conditions demonstrated increased symptoms of MWVD and susceptibility to the pathogens Rhizoctonia and Pythium spp. Alanap, N-1-naphthylphthalamic acid (NPA), is a preemergent herbicide that functions as an inhibitor of auxin efflux and is widely used by watermelon farmers to impede obnoxious weeds. Metabolism ofAlanap in planta involves aryl amidases (aminopeptidases) that also function in defense responses. We hypothesize that negative cultural practices are likely to inhibit defense responses and watermelon resistance to residual Alanap, leading to MWVD. We suggest that MWVD incidence is increased by certain common cultural conditions and that the incidence of MWVD can be reduced by altering these cultural practices.

Revue / Journal Title

HortScience   ISSN 0018-5345   CODEN HJHSAR 

Source / Source

2005, vol. 40, n^o3, pp. 597-601 [5 page(s) (article)] (19 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Society for Horticultural Science, Alexandria, VA, ETATS-UNIS  (1966) (Revue)

Mots-clés anglais / English Keywords

Aromatic compound ; Plant growth substance ; Auxin ; Naphthalene derivatives ; Aromatic amine ; Experimental plant ; Fruit crop ; Enzyme ; Hydrolases ; Peptidases ; Cruciferae ; Cucurbitaceae ; Spermatophyta ; Angiospermae ; Dicotyledones ; Vitidaceae ; 1-Naphthaleneacetic acid ; Aminopeptidases ; Arabidopsis thaliana ; Citrullus lanatus ; Liana ; Vitis ; Horticulture ; Watermelon ; Syndrome ;

Mots-clés français / French Keywords

Composé aromatique ; Substance croissance végétal ; Auxine ; Naphtalène dérivé ; Amine aromatique ; Plante expérimentale ; Plante fruitière ; Enzyme ; Hydrolases ; Peptidases ; Cruciferae ; Cucurbitaceae ; Spermatophyta ; Angiospermae ; Dicotyledones ; Vitidaceae ; 1-Naphtylamine ; Naphtalène-1-acétique acide ; Aminopeptidases ; Arabidopsis thaliana ; Citrullus lanatus ; Liane ; Vitis ; Horticulture ; Pastèque ; Syndrome ;

Mots-clés espagnols / Spanish Keywords

Compuesto aromático ; Substancia crecimiento vegetal ; Auxina ; Naftaleno derivado ; Amina aromática ; Planta experimental ; Planta frutal ; Enzima ; Hydrolases ; Peptidases ; Cruciferae ; Cucurbitaceae ; Spermatophyta ; Angiospermae ; Dicotyledones ; Vitidaceae ; 1-Naftalenoacético ácido ; Aminopeptidases ; Arabidopsis thaliana ; Citrullus lanatus ; Liana ; Vitis ; Horticultura ; Sandía ; Síndrome ;

Mots-clés d'auteur / Author Keywords

Citrullus lunatus ; Alanap ; NPA ; aminopeptidase ; α-naphthylamine ; 1,1'-azonaphthylene ; ANA ; Arabidopsis ; MWVD ;

Localisation / Location

INIST-CNRS, Cote INIST : 13300, 35400012984325.0210