Abstract
Drought is a wide-spread problem seriously influencing sweet melon (Cucumis melo var. Aegyptiacus L.) production and quality. Therefore, the identification or development of tolerant genotypes is of high importance for incorporating in sweet melon production. Hence, two field experiments were conducted in a clay loam soil at Baramoon Experimental Farm, Dakahlia Governorate, Egypt during the two summer seasons of 2009 and 2010, to evaluate five sweet melon cultivars (Shahd El-Dokki, Ananas El-Dokki, Ismaelawi, Kahera-6 improved, Albasosi) under regular irrigation and stress conditions using a split plot design with three replicates. Drought conditions were started after first irrigation and created by reducing the frequency of irrigation by one half compared with regularly irrigated plants, i.e., missing alternate irrigation. Results indicated that exposing the sweet melon cultivars to water stress led to significant decreases in fruit weight, fruit length, fruit width, flesh fruit thickness, total yield per plant and Leaf relative water content in both seasons. Whereas, water deficit caused significant increases in total soluble solids in both seasons. The tested cultivars markedly varied among them in all estimated characters in both seasons. The interaction between irrigation levels and cultivars had significant effects on all traits under study. Cultivars with the highest yield and yield components under non-stress conditions had the highest yield and yield components under stress conditions, and this was true in both seasons. On the basis of the drought resistance indices (drought susceptibility index, relative yield reduction and relative yield values), Kahera-6 improved was relatively stress susceptible, whereas Albasosi was more tolerant and stable cultivar so; this cultivar could be further tested for their drought confirming characteristics.
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Claims 13
Claim · model-written summary
Water stress significantly decreased fruit weight.
Verbatim
e0“exposing the sweet melon cultivars to water stress led to significant decreases in fruit weight, fruit length, fruit width, flesh fruit thickness, total yield per plant and Leaf relative water content in both seasons.”
e1“under regular irrigation and stress conditions”
Claim · model-written summary
Water stress significantly decreased fruit length.
Verbatim
e0“exposing the sweet melon cultivars to water stress led to significant decreases in fruit weight, fruit length, fruit width, flesh fruit thickness, total yield per plant and Leaf relative water content in both seasons.”
e1“under regular irrigation and stress conditions”
Claim · model-written summary
Water stress significantly decreased fruit width.
Verbatim
e0“exposing the sweet melon cultivars to water stress led to significant decreases in fruit weight, fruit length, fruit width, flesh fruit thickness, total yield per plant and Leaf relative water content in both seasons.”
e1“under regular irrigation and stress conditions”
Claim · model-written summary
Water stress significantly decreased flesh fruit thickness.
Verbatim
e0“exposing the sweet melon cultivars to water stress led to significant decreases in fruit weight, fruit length, fruit width, flesh fruit thickness, total yield per plant and Leaf relative water content in both seasons.”
e1“under regular irrigation and stress conditions”
Claim · model-written summary
Water stress significantly decreased total yield per plant.
Verbatim
e0“exposing the sweet melon cultivars to water stress led to significant decreases in fruit weight, fruit length, fruit width, flesh fruit thickness, total yield per plant and Leaf relative water content in both seasons.”
e1“under regular irrigation and stress conditions”
Claim · model-written summary
Water stress significantly decreased Leaf relative water content.
Verbatim
e0“exposing the sweet melon cultivars to water stress led to significant decreases in fruit weight, fruit length, fruit width, flesh fruit thickness, total yield per plant and Leaf relative water content in both seasons.”
e1“under regular irrigation and stress conditions”
Claim · model-written summary
Water deficit significantly increased total soluble solids.
Verbatim
e0“water deficit caused significant increases in total soluble solids in both seasons.”
e1“under regular irrigation and stress conditions”
t0“SWEET MELON”
Claim · model-written summary
Cultivars differed markedly across estimated characters in both seasons.
Verbatim
e0“The tested cultivars markedly varied among them in all estimated characters in both seasons.”
Claim · model-written summary
Irrigation level interacted significantly with cultivar for all studied traits.
Not reportedDirection
Verbatim
e0“The interaction between irrigation levels and cultivars had significant effects on all traits under study.”
Claim · model-written summary
Cultivars with the highest yield without stress also had the highest yield under stress.
Verbatim
e0“Cultivars with the highest yield and yield components under non-stress conditions had the highest yield and yield components under stress conditions”
Claim · model-written summary
Kahera-6 improved was relatively stress susceptible.
Verbatim
e0“Kahera-6 improved was relatively stress susceptible, whereas Albasosi was more tolerant and stable cultivar”
Claim · model-written summary
Albasosi was more tolerant and stable.
Verbatim
e0“Kahera-6 improved was relatively stress susceptible, whereas Albasosi was more tolerant and stable cultivar”
Claim · model-written summary
The authors suggest further testing of Albasosi for drought characteristics.
Verbatim
e0“Albasosi was more tolerant and stable cultivar so; this cultivar could be further tested for their drought confirming characteristics.”
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