Genetic Advance and Grain Yield Stability of Moroccan Durum Wheats Grown under Rainfed and Irrigated Conditions

Table 6

Correlations between analyzed traits in six durum wheat varieties released in different periods (old, intermediate, and modern) grown under two water regimes: irrigated (upper right diagonal) and rainfed (lower left diagonal) during three growing seasons (2017, 2018, and 2019).

	Grain yield		Spikes per m^2		Kernels per spike		Kernel weight		Harvest index		Spikelets per spike		Kernels per spikelet		Fertile tillering		Plant height		Spike length
Grain yield	—	—	0.832		−0.714	—	0.583	—	0.818		0.814		−0.815		0.912		−0.812		0.839
Spikes per m^2	0.960		—	—	−0.946		0.811	—	0.993		0.943		−0.978		0.907		−0.898		0.945
Kernels per spike	−0.934		−0.960		—	—	−0.954		−0.924		−0.865		0.941		−0.849		0.834		−0.971
Kernel weight	0.960		0.880		−0.907		—	—	0.781	—	0.730	—	−0.830		0.731	—	−0.729	—	0.920
Harvest index	−0.770	—	−0.653	—	0.774	—	0.897		—	—	0.953		−0.976		0.874		−0.931		0.918
Spikelets per spike	−0.612	—	−0.489	—	0.606	—	−0.602	—	0.663	—	—	—	−0.984		0.768	—	−0.861		0.898
Kernels per spikelet	−0.126	—	−0.293	—	0.178	—	−0.105	—	−0.136	—	−0.665	—	—	—	−0.832		0.881		−0.955
Fertile tillering	−0.159	—	−0.102	—	0.122	—	−0.015	—	−0.075	—	0.682	—	−0.660	—	—	—	−0.828		0.892
Plant height	0.705	—	0.503	—	−0.573	—	0.764		−0.825		−0.867		0.536	—	0.372	—	—	—	−0.844
Spike length	−0.858		−0.787	—	0.774	—	−0.760	—	0.625	—	0.862		−0.331	—	0.585	—	−0.810	—	—	—

Significant at 0.05 probability level. Significant at 0.01 probability level. Significant at 0.001 probability level.