Delgado-Sánchez P., Yáñez-Espinosa L., Jiménez-Bremont J. F., Chapa-Vargas L., Flores J., Ecophysiological and Anatomical Mechanisms behind the Nurse Effect: Which Are More Important? A Multivariate Approach for Cactus Seedlings, PLOS ONE, 2013, 8(11):e81513, doi: 10.1371/journal.pone.0081513
The study of Opuntia streptacantha seedlings compares lighting and watering treatments. The results show the interaction of water and light availability in early plant development.