Previous studies have indicated that higher-yielding crops tended to show higher leaf photosynthetic efficiency, and the photosynthetic parameters [net photosynthetic rates (P)] reflected crop photosynthetic efficiency and could be used to evaluate the performance of different cultivars [14,15,16,17].
Photosynthetic efficiency differs at different crop growth stages, and differences in the proportion that photosynthesis contributes to yield could be found at different growth stages [18,19].
(L.) Gaertn.) is a dicotyledonous plant of the family Polygonaceae.
It is widely grown worldwide (such as India, Russia, Japan, France, Canada, Poland, Slovenia, and Nepal) for its medicinal and nutritive value but could be more fully utilized as a resource for human consumption [1,2,3].
Tartary buckwheat has an indeterminate growth habit that results in a high demand for photosynthates after anthesis to support simultaneous flowering, fruiting and grain filling .
After anthesis, carbon assimilation from the photosynthetic organs plays a crucial role in determining yield.
The leaves of all cultivars aged gradually after flowering, and the leaf chlorophyll (Chl) and soluble protein (SP) contents, net photosynthetic rates (P) showed the opposite trend.
Cultivars Xi Qiao2 and Qian Ku3 produced more total dry matter (mean 17.1% higher), had higher harvest index (HI, mean 16.4% higher), and yield (mean 29.0% higher) than cvs.
It has been called one of the most complete and nutritious foods, being rich in minerals, vitamins, protein, dietary fiber, amino acids, trace elements, and various bioactive phytochemicals [4,5,6,7,8].
Due to its potential health benefits, Tartary buckwheat is consumed by an increasing number of people globally .