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Mean performance and heterosis for yield and fruit traits of tomato under drought [electronic resource]

By:

Badr, Lotfy A. A

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Language: English Summary language: Arabic Description: p.359-370Uniform titles:

Annals of agricultural science, Moshtohor, 2018 v.56 (2) [electronic resource]

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In: Annals of Agricultural Science, Moshtohor 2018.v.56(2)Summary: The present study was carried out in a private farm, Kaha city, Kalyobiya Govemorate, Egypt during summer seasons of 2015 and 2016 to study the mean performance and heterosis for yield and fruit traits for six tomato cultivars, i.e. Tan Shit Star (p1), Real Stone (p2), Pearsone Imp (p3), Super marmande (p4), grown under normal irrigation and drought stress. This investigation was a half di all el F1 cross experiment to induce genetic variability by hybridization and evaluation and selection for best genotypes of tomato compared with the parents under drought conditions and normal irrigation. Two adjacent experiments were conducted. Where, the first experiment was irrigated every month (environment 1) and the second one was normally irrigated, i.e., every 2 week (environment 2). The data of the two experiment~ were subjected to proper statistical analysis of variance and estimate the mean performance of parents and their crosses. Data indicated that the P6 gave the highest values for total yield per plant under drought stress and combined analysis, respectively while the cross P1xP4 and P1xP6 expressed the highest values for total yield per plant under drought stress, normal irrigation and combined analysis. Moreover the highest number of fruits was detected for the parent P5 and the cross P5xP6 in drought condition, normal irrigation and combined analysis. Three, three and two crosses expressed significant or highly significant and positive heterosis relative to mid parent for fruits number in drought condition, normal irrigation and combined analysis, respectively. Moreover, highly significant and positive better parent heterosis were detected in 3, 2 and 2 crosses in drought stress, normal irrigation and combined analysis, respectively. It was clear that the cross P1 x P4 expressed the highest desirable heterosis relative to mid parent and better parent in the two environments treatments and combined analysis of them. ·

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The present study was carried out in a private farm, Kaha city, Kalyobiya Govemorate, Egypt during summer
seasons of 2015 and 2016 to study the mean performance and heterosis for yield and fruit traits for six tomato
cultivars, i.e. Tan Shit Star (p1), Real Stone (p2), Pearsone Imp (p3), Super marmande (p4), grown under normal
irrigation and drought stress. This investigation was a half di all el F1 cross experiment to induce genetic variability
by hybridization and evaluation and selection for best genotypes of tomato compared with the parents under
drought conditions and normal irrigation. Two adjacent experiments were conducted. Where, the first experiment
was irrigated every month (environment 1) and the second one was normally irrigated, i.e., every 2 week
(environment 2). The data of the two experiment~ were subjected to proper statistical analysis of variance and
estimate the mean performance of parents and their crosses. Data indicated that the P6 gave the highest values for
total yield per plant under drought stress and combined analysis, respectively while the cross P1xP4 and P1xP6
expressed the highest values for total yield per plant under drought stress, normal irrigation and combined analysis.
Moreover the highest number of fruits was detected for the parent P5 and the cross P5xP6 in drought condition,
normal irrigation and combined analysis. Three, three and two crosses expressed significant or highly significant
and positive heterosis relative to mid parent for fruits number in drought condition, normal irrigation and
combined analysis, respectively. Moreover, highly significant and positive better parent heterosis were detected
in 3, 2 and 2 crosses in drought stress, normal irrigation and combined analysis, respectively. It was clear that the
cross P1 x P4 expressed the highest desirable heterosis relative to mid parent and better parent in the two
environments treatments and combined analysis of them. ·

Summary in Arabic

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