Attenuation of low-temperature stress in rice seedlings

Grohs, Mara; Marchesan, Enio; Roso, Rodrigo; Moraes, Bibiana Silveira

doi:10.1590/1983-40632016v4640436

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Scientific Articles • Pesqui. Agropecu. Trop. 46 (2) • Apr-Jun 2016 • https://doi.org/10.1590/1983-40632016v4640436 copy

Attenuation of low-temperature stress in rice seedlings

Atenuação de estresse por baixa temperatura em plântulas de arroz

Authorship SCIMAGO INSTITUTIONS RANKINGS

ABSTRACT

Rice is a cold-sensitive crop, and its exposure to low-temperature stress, during germination and early seedling growth, can negatively affect the initial stand establishment. Substances that act as growth regulators can be used to mitigate this initial stress. Thus, the influence of gibberellic acid, thiamethoxam and a phytohormone was investigated at the growth variables and antioxidant enzyme activity of the 'Irga 424' and 'Puita Inta CL' rice cultivars, at low-temperature (17 ºC). The products act on the germination percentage of 'Puita Inta CL', but vigor is only influenced by giberellic acid. Giberellic acid influences shoot length, irrespective of cultivar, while thiamethoxam and the phytohormone only affect length in 'Puita Inta CL'. The antioxidant activity depends on the cultivar and organ tested (shoot or root). These products mitigate the effects of cold, thereby preventing the formation of reactive-oxygen species and lipid peroxidation, and positively influence the superoxide dismutase enzyme activity.

KEY-WORDS:
Oryza sativa L.; growth regulator; gibberellic acid

Dependent variable	Organ	Day	Independent variable
Dependent variable	Organ	Day	Cultivar (C)	Product (P)	C x P
Germination	-	7	0.52^* * significant for p ≤ 0.05.	2.20^* * significant for p ≤ 0.05.	0.40^* * significant for p ≤ 0.05.
Germination	-	14	0.09^* * significant for p ≤ 0.05.	0.11^* * significant for p ≤ 0.05.	0.03^* * significant for p ≤ 0.05.
Length	Shoot	10	0.88^* * significant for p ≤ 0.05.	1.34^* * significant for p ≤ 0.05.	0.10^* * significant for p ≤ 0.05.
	Shoot	14	15.69^* * significant for p ≤ 0.05.	22.88^* * significant for p ≤ 0.05.	1.56^* * significant for p ≤ 0.05.
	Root	10	11.25^* * significant for p ≤ 0.05.	0.99^* * significant for p ≤ 0.05.	0.36^* * significant for p ≤ 0.05.
	Root	14	31.3^* * significant for p ≤ 0.05.	1.00^* * significant for p ≤ 0.05.	2.06^* * significant for p ≤ 0.05.
H₂O₂ content	Shoot	7	0.0002^* * significant for p ≤ 0.05.	0.002^* * significant for p ≤ 0.05.	0.001^* * significant for p ≤ 0.05.
	Shoot	14	0.0004^* * significant for p ≤ 0.05.	0.002^* * significant for p ≤ 0.05.	0.001^* * significant for p ≤ 0.05.
	Root	7	0.0001^* * significant for p ≤ 0.05.	0.00007^* * significant for p ≤ 0.05.	0.00009^* * significant for p ≤ 0.05.
	Root	14	0.0005^* * significant for p ≤ 0.05.	0.00004^ns ns not significant;	0.0001^* * significant for p ≤ 0.05.
MDA content	Shoot	7	1.19^* * significant for p ≤ 0.05.	0.27^* * significant for p ≤ 0.05.	0.24^* * significant for p ≤ 0.05.
	Shoot	14	3.52^* * significant for p ≤ 0.05.	2.63^* * significant for p ≤ 0.05.	2.89^* * significant for p ≤ 0.05.
	Root	7	1.99^* * significant for p ≤ 0.05.	12.37^* * significant for p ≤ 0.05.	3.03^* * significant for p ≤ 0.05.
	Root	14	0.38^* * significant for p ≤ 0.05.	2.49^* * significant for p ≤ 0.05.	0.32^* * significant for p ≤ 0.05.
APX activity	Shoot	7	0.18^* * significant for p ≤ 0.05.	0.26^* * significant for p ≤ 0.05.	0.059^* * significant for p ≤ 0.05.
	Shoot	14	0.21^* * significant for p ≤ 0.05.	0.19^* * significant for p ≤ 0.05.	0.02^* * significant for p ≤ 0.05.
	Root	7	0.02^* * significant for p ≤ 0.05.	0.57^* * significant for p ≤ 0.05.	0.03^* * significant for p ≤ 0.05.
	Root	14	0.15^* * significant for p ≤ 0.05.	0.15^* * significant for p ≤ 0.05.	0.49^* * significant for p ≤ 0.05.
CAT activity	Shoot	7	1.77^* * significant for p ≤ 0.05.	4.05^* * significant for p ≤ 0.05.	3.6^* * significant for p ≤ 0.05.
	Shoot	14	0.8^* * significant for p ≤ 0.05.	4.78^* * significant for p ≤ 0.05.	0.92^* * significant for p ≤ 0.05.
	Root	7	3.65^* * significant for p ≤ 0.05.	3.44^* * significant for p ≤ 0.05.	1.17^* * significant for p ≤ 0.05.
	Root	14	1.57^* * significant for p ≤ 0.05.	3.97^* * significant for p ≤ 0.05.	4.76^* * significant for p ≤ 0.05.
SOD activity	Shoot	7	0.0006^ns ns not significant;	0.012^* * significant for p ≤ 0.05.	0.013^* * significant for p ≤ 0.05.
	Shoot	14	0.31^* * significant for p ≤ 0.05.	0.001^* * significant for p ≤ 0.05.	0.08^* * significant for p ≤ 0.05.
	Root	7	4.13^* * significant for p ≤ 0.05.	2.29^* * significant for p ≤ 0.05.	1.91^* * significant for p ≤ 0.05.
	Root	14	0.03^* * significant for p ≤ 0.05.	0.04^* * significant for p ≤ 0.05.	0.012^* * significant for p ≤ 0.05.

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[TFN1] Numbers represent F values at 5 %:

[TFN2] ^ns
not significant;

[TFN3] ^*
significant for p ≤ 0.05.