PLANT AND CELL PHYSIOLOGY, vol. 45, no. 7, page. 923 - 932, 2004-07
SCIENCE, vol. 285, no. 5433, page. 1579 - 1582, 1999-09-03
JOURNAL OF PLANT PHYSIOLOGY, vol. 151, no. 3, page. 339 - 345, 1997-09