Ponce-Bautista A., Valverde P. L., Flores J., Zavala-Hurtado A., Vite F., López-Ortega G., Pérez-Hernández M. A., Photosynthetically active radiation and carbon gain drives the southern orientation of Myrtillocactus geometrizans fruits, Plant Biology, 2017, 19(2):279-285, doi: 10.1111/plb.12530
Three Mexican populations were compared for fruit position, photosynthetically active radiation and the overnight increase in stem acidity. Relationships with fruit production depended on site and season. Overnight acidity served as an indirect indicator of carbon gain.