Biochemical differences in the initial growth of sugarcane varieties cultivated under different potassium doses and water conditions

Rocha, Igor T. M. da; Silva, Anibia V. da; Freire, Fernando J.; Oliveira, Emídio C. A. de; Souza, Edivan R. de; Endres, Laurício

doi:10.1590/1983-21252023v36n107rc

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Agronomy • Rev. Caatinga 36 (1) • Jan-Mar 2023 • https://doi.org/10.1590/1983-21252023v36n107rc copy

Biochemical differences in the initial growth of sugarcane varieties cultivated under different potassium doses and water conditions

Diferenças bioquímicas no crescimento inicial de variedades de cana-de-açúcar cultivadas sob doses de potássio e condições hídricas

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Sugarcane varieties have distinct biochemical and productive capacities, which are accentuated under water and nutrient stress conditions. Water stress promotes biochemical changes in plants, such as the overproduction of reactive oxygen species (ROS) that, depending on the concentration, degrade photosynthetic pigments. Current research indicates that K⁺ plays an important role in increasing yield and tolerance to water stress. This study evaluated the effect of different K⁺ levels on the initial growth of two sugarcane varieties under two water conditions. The experiment was conducted in a greenhouse using randomized blocks, with four replications, five K⁺ doses (0; 0.5; 1; 2 and 6 mmol L^-1), two sugarcane varieties (RB92579 and RB992506), and two water conditions (hydrated plants and water stress). Data were analyzed in a 5×2×2 factorial scheme. Leaf carbohydrates, photosynthetic pigments, antioxidant enzyme activity (catalase, superoxide dismutase and ascorbate peroxidase) and dry matter production were assessed. K⁺ doses promoted an increase in plant dry mass. The RB992506 variety had lower APX activity and higher levels of photosynthetic pigments, carbohydrates and dry matter than its RB92579 counterpart. Water conditions and interactions between factors had no effect on the variables studied. RB992506 is a promising variety and more tolerant to water stress due to its superior biochemical and productive traits when compared to RB92579.

Keywords:
Saccharum spp; ROS; Leaf pigments; Water stress; Ascorbate peroxidase

	Leaf content
	Chl a (mg g^-1 FM)^(¹)	Chl b (mg g^-1 FM)	Total chl (mg g^-1 FM)	Carotenoids (μmol mg^-1 FM)
F-test in analysis of variance
K⁺ (mmol L^-1)	0.79^ns	0.54^ns	0.73^ns	1.16^ns
Variety	12.89**	6.56**	11.32**	14.80**
Water condition	0.43^ns	0.39^ns	0.42^ns	3.36^ns
K⁺ × Variety	0.43^ns	0.46^ns	0.43^ns	0.55^ns
K⁺ × W. cond.^(²)	1.22^ns	1.15^ns	1.20^ns	1.77^ns
Var^(³) × W. cond.	2.71^ns	2.16^ns	2.59^ns	2.26^ns
K⁺ × Var × W. cond	1.87^ns	1.81^ns	1.86^ns	2.23^ns
CV%^(⁴)	30.5	27.84	29.73	20.62

	Carbohydrates (mg g^-1 DM)^(¹)	Dry matter (g/pot)
	F-test in analysis of variance
K⁺ (mmol L^-1)	1.52^ns	4474.78*
Variety	5.63*	52818.97*
Water condition	0.38^ns
K⁺ × Variety	1.16^ns	940.10^ns
K⁺ × W. cond.^(²)	0.73^ns
Var^(³) × W. cond.	2.55^ns
K⁺ × Var × W. cond	0.45^ns
CV%^(⁴)	14.03	22.55

	Leaf content
	CAT ^(¹)	SOD ^(²)	APX ^(³)
	F-test in analysis of variance
K⁺ (mmol L^-1)	2.93^ns	2.67^ns	1.36^ns
Variety	6.43^ns	0.77^ns	12.55**
Water condition	2.08^ns	6.03^ns	2.70^ns
K⁺ × Variety	0.37^ns	3.12^ns	0.57^ns
K⁺ × W. cond.^(⁴)	0.37^ns	0.32^ns	1.24^ns
Var^(⁵) × W. cond.	0.74^ns	1.86^ns	1.11^ns
K⁺ × Var × W. cond.	2.16^ns	1.44^ns	0.28^ns
CV%^(⁶)	26.81	81.35	32.36

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[1] *Corresponding author: <igor.rocha@ufrpe.br>