Edwin T. Bingham Dept. of Agronomy, Univ. The list is not complete and is continuously refined.
Persistence is essentially adaptation.
Adaptation is the most fundamental trait in the perenniality of alfalfa, and perenniality requires persistence. Persistence has its own genetic base. The base is not necessarily the same for all materials with equivalent persistence. And, there is much interaction with specific traits. The genetic base is not fixed in most materials and requires selection to maintain it.