(Effect of variety and dosage of mycorrhiza on the growth and yield of pepper plants (Capsicum annuum L.) in Andisol)

Effect of variety and dosage of mycorrhiza on the growth and yield of pepper plants (Capsicum annuum L.) in Andisol. This study aims to determine the effect of varieties and doses of mycorrhiza on the growth and yield of pepper plants on land Andisol and the interaction between these two factors. This research was conducted at the experimental garden in plant physiology laboratory university agricultural Faculty Syiah Kuala start of June 2015 until December 2015. Research using Random Group 4x3 factorial design with three replications, consisting of 36 experimental units consisting of two factors. he first factor is the dose mycorhiza consists of 4 levels of 0, 5, 10 and 15 g / plant. The second factor varieties consisting of Carlos F1, F1 Kiyo, and La Odeng. The results showed that variety significant effect on yield of pepper plants. The best varieties are varieties Kiyo F1 on the generative phase that can be seen from the weight of the fruit crop age parameter 110 HST and 45 HST mycorhiza infection. While the dose of mycorrhizal significant effect on the growth and yield of pepper plants on land Andisol. Dose best mycorrhiza contained in 10g / plants that can be seen in the number of fruit crops as well as the parameters of mycorhiza infection most. Research also shows there is a higher interaction on Carlos F1 varieties with a dose of 15 g / plant in the parameters the number of leaf age 15 HST, At the age of 30 HST rod diameter also gives the best result in two different varieties, namely in Carlos F1 hybrid varieties and local varieties La Odeng on mycorrhizal dose of 15 g / plant and root infection aged 45 HST. La Odeng varieties give the highest number of mycorrhizal infection in mycorrhizal dose of 10 g / plant.

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Contrasting Rootstock-Mediated Growth and Yield Responses in Salinized Pepper Plants (Capsicum annuum L.) Are Associated with Changes in the Hormonal Balance

International Journal of Molecular Sciences ◽

10.3390/ijms22073297 ◽

2021 ◽

Vol 22 (7) ◽

pp. 3297

Author(s):

Amparo Gálvez ◽

Alfonso Albacete ◽

Cristina Martínez-Andújar ◽

Francisco M. del Amor ◽

Josefa López-Marín

Keyword(s):

Capsicum Annuum ◽

Salinity Tolerance ◽

Vegetative Growth ◽

Physiological Responses ◽

Fruit Yield ◽

Growth And Yield ◽

Capsicum Annuum L ◽

Hormonal Balance ◽

Yield Responses ◽

Pepper Plants

Salinity provokes an imbalance of vegetative to generative growth, thus impairing crop productivity. Unlike breeding strategies, grafting is a direct and quick alternative to improve salinity tolerance in horticultural crops, through rebalancing plant development. Providing that hormones play a key role in plant growth and development and stress responses, we hypothesized that rootstock-mediated reallocation of vegetative growth and yield under salinity was associated with changes in the hormonal balance. To test this hypothesis, the hybrid pepper variety (Capsicum annuum L. “Gacela F1”) was either non-grafted or grafted onto three commercial rootstocks (Creonte, Atlante, and Terrano) and plants were grown in a greenhouse under control (0 mM NaCl) and moderate salinity (35 mM NaCl) conditions. Differential vegetative growth versus fruit yield responses were induced by rootstock and salinity. Atlante strongly increased shoot and root fresh weight with respect to the non-grafted Gacela plants associated with improved photosynthetic rate and K+ homeostasis under salinity. The invigorating effect of Atlante can be explained by an efficient balance between cytokinins (CKs) and abscisic acid (ABA). Creonte improved fruit yield and maintained the reproductive to vegetative ratio under salinity as a consequence of its capacity to induce biomass reallocation and to avoid Na+ accumulation in the shoot. The physiological responses associated with yield stability in Creonte were mediated by the inverse regulation of CKs and the ethylene precursor 1-aminocyclopropane-1-carboxylic acid. Finally, Terrano limited the accumulation of gibberellins in the shoot thus reducing plant height. Despite scion compactness induced by Terrano, both vegetative and reproductive biomass were maintained under salinity through ABA-mediated control of water relations and K+ homeostasis. Our data demonstrate that the contrasting developmental and physiological responses induced by the rootstock genotype in salinized pepper plants were critically mediated by hormones. This will be particularly important for rootstock breeding programs to improve salinity tolerance by focusing on hormonal traits.

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