Paper Information

Journal:   JOURNAL OF ENTOMOLOGICAL SOCIETY OF IRAN (JESI)   2017 , Volume 37 , Number 2 #H0051; Page(s) 193 To 205.
 
Paper: 

EFFECT OF COLD ACCLIMATION AND RAPID COLD HARDINESS ON COLD TOLERANCE AND CRYOPROTECTANTS OF THE GREENBUG SCHIZAPHIS GRAMINUM (HEMIPTERA: APHIDIDAE)

 
 
Author(s):  SAEIDI FATEMEH, MOHARRAMIPOUR SAEID*, MIKANI AZAM
 
* DEPARTMENT OF ENTOMOLOGY, FACULTY OF AGRICULTURE, TARBIATMODARES UNIVERSITY, TEHRAN, IRAN
 
Abstract: 

Insects can increase their survival at subzero temperatures, prior to long or short term exposure, to non-lethal cold temperatures by cold acclimation (ACC) or rapid cold hardiness (RCH). In this research, the effect of rapid or gradual decrease in temperature on cold tolerance of adults of the greenbug, Schizaphis graminum (Rondani) was investigated. LT50 (lower lethal temperature for 50% mortality) of aphids acclimated at 10°C for one week showed no significant differences with control (aphids reared at 20°C). In addition to the cold acclimation, adults of S. graminum showed RCH response too. When the rearing aphids at 20°C were transferred directly to a range of sub-zero temperatures for 2 h, LT80 (lower lethal temperature for 80% mortality) was -11.6 °C, but acclimation at 0°C for 5 h before transfer to -11.6 °C, induced maximum RCH, led to increase of survival to 73%. RCH was induced by cooling of the insects at 0°C for different rates. Maximum survival (66%) was achieved by cooling at 0.05°C/min. Accumulation of sugars and polyols is one of the major mechanisms underlying ACC and RCH. In this study, trehalose and glucose increased considerably through ACC and RCH treatments, suggesting the role of these compounds in increasing cold tolerance of S. graminum.

 
Keyword(s): SCHIZAPHIS GRAMINUM, COLD ACCLIMATION, RAPID COLD HARDINESS, CRYOPROTECTANTS, TREHALOSE
 
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