Knob in relation to altitude --Mandal, SS, Akhtar, SA, Sinha, NK, Srivastava, M Low land tropical parents, namely CML47 and CML49, exhibited comparatively higher knob number, 7.0 and 6.0 respectively. Three hybrids, namely CML47 x CML49 (6.33), CML47 x CML107 (6.00) and CML49 x CML47 (5), have comparatively higher number of knobs with significantly higher yield. It is remarkable that the Gangetic plain of Bihar (Maize Research Centre Dholi) lies in lower altitudes of 52.2 MSL. Furthermore, Ganga Safed-2, a stable variety doing well for the last 3 decades in the Gangetic plains of India, has a comparatively higher number of knobs (6.0). The present finding was in agreement with the findings of Longley (1938), Mangelsdorf and Cameron (1942), Brown (1945), Wellhausen et al. (1951), Wellhausen and Prywer (1954), McClintock (1960) and Pandey et al. (1988). However, one higher yield cross, CML107 x CML47, possesses only 4.0 knobs. Remarkably, one parent (CML47) involved in the cross possesses a relatively higher number of knobs (7.0). Keeping in view this fact, there is a growing need to consider knob heterochromatin in a controlled, reproducible and predictable manner to derive hybrids and selection of inbreds.
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