CROP	
  PHYSIOLOGY	
  OF	
  SUGARCANE:	
  ASSESSING	
  THE	
  PHYSIOLOGICAL	
  
ROLE	
  OF	
  ROOTS	
  
	
  	
  
Rafael	
 ...
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Crop Physiology of Sugarcane: assessing the physiological role of roots

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Event / Evento: II Workshop on Sugarcane Physiology for Agronomic Applications

Speaker / Palestrante: Rafael V. Vasconcelos (University of Campinas - Unicamp)
Date / Data: Oct, 29-30th 2013 / 29 e 30 de outubro de 2013
Place / Local: CTBE/CNPEM Campus, Campinas, Brazil
Event Website / Website do evento: www.bioetanol.org.br/sugarcanephysiology

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Crop Physiology of Sugarcane: assessing the physiological role of roots

  1. 1. CROP  PHYSIOLOGY  OF  SUGARCANE:  ASSESSING  THE  PHYSIOLOGICAL   ROLE  OF  ROOTS       Rafael  V.  Ribeiro   University   of   Campinas   (Unicamp),   Institute   of   Biology,   Dept.   Plant   Biology,   Campinas  SP,  Brazil.  E-­‐mail:  rvr@unicamp.br       Recent  results  of  research  on  sugarcane  physiology  were  presented,  taking  into   account   the   role   of   root   system   under   water   limiting   conditions.   Considering   plants   growing   in   rhizotrons   and   nutrient   solution,   some   interesting   responses   of   sugarcane   varieties   were   revealed.   As   key   findings,   our   data   indicate   that   classical   growth   analysis   can   reveal   the   degree   of   drought   resistance   more   properly  than  physiological  evaluations.  In  addition,  high  yield  varieties  are  not   necessarily   sensitive   to   drought   stress.   The   expected   trade-­‐off   between   plant   biomass   production   and   drought   tolerance   was   not   found   in   our   study,   suggesting   that   we   may   find   sugarcane   varieties   with   high   yield   and   tolerance   against   environmental   constrains.   In   general,   low   phenotypic   plasticity   is   associated  with  less  sensitivity  to  water  deficit,  considering  both  morphological   and  physiological  plasticity.  From  our  study  under  nutrient  solution,  we  noticed   that   the   drought   resistant   genotype   is   able   to   delay   drought   effects   on   leaf   physiology,   showing   less   sensitivity   of   root   hydraulic   conductance   and   photosynthesis  to  water  deficit.  Root  aquaporins  play  an  important  role  in  water   relations,   with   the   response   to   water   deficit   being   genotype-­‐dependent.   However,   increased   aquaporin   expression   (PIPs)   in   roots   at   the   early   stages   of   water  deficit  is  not  directly  related  to  improvements  of  water  transport  through   root  system.  

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