Rice Genotypes with SUB1 QTL Differ in Submergence Tolerance, Elongation Ability during Submergence and Re-generation Growth at Re-emergence

Rice

Table 2 Correlation coefficients among different physiological parameters with survival and dry matter accumulation

Parameters	Fv/Fm	ETo/CS	PI	NSC14DS	DW14DS	Sur14DS	RDW14DS	NSC20DS	DW20DS	Sur20DS	RDW20DS
Chlorophyll	0.473	0.698	0.586	0.017	0.178	-0.010	0.333	0.431	0.604	0.280	0.571
Fv/Fm	---	0.706	0.890	0.305	0.722	0.431	0.772	0.568	0.427	0.634	0.717
ETo/CS		---	0.826	-0.046	0.425	0.123	0.562	0.674	0.523	0.425	0.689
PI			---	0.099	0.617	0.241	0.771	0.612	0.603	0.544	0.770
NSC14DS				---	0.422	0.602	0.442	-0.123	-0.272	0.491	-0.003
DW14DS					---	0.419	0.761	0.386	0.389	0.760	0.641
Sur14DS						---	0.440	0.242	-0.106	0.591	0.168
RDW14DS							---	0.582	0.510	0.822	0.763
NSC20DS								---	0.676	0.574	0.847
DW20DS									---	0.323	0.886
Sur20DS										---	0.603

The correlation coefficients greater than 0.468 and 0.590 signify the significant association at *p<0.05 and **p<0.01 levels, respectively (degrees of freedom, 16). The correlation study was done excluding the data of susceptible cultivars i.e. Swarna and IR 42 to know whether different physiological parameters either could make distinction among the different tolerant cultivars or not in respect of survival and regeneration growth. Data on chlorophyll, Fv/Fm ratio, ETo/CS and PI were taken after 14 days of submergence along with corresponding control plants. Normalized data of these parameters were used in the correlation studies. In other cases absolute data based on two years average were taken. NSC14DS, non-structural carbohydrate content after 14 days of submergence; DW14DS, total above ground dry matter content after 14 days of submergence; Sur14DS, survival percentage due to 14 days of submergence; RDW14DS, total above ground dry matter content at 15 days of re-emergence affected by 14 days of submergence; NSC20DS, non-structural carbohydrate content after 20 days of submergence; DW20DS, total above ground dry matter content after 20 days of submergence; Sur20DS, survival percentage due to 20 days of submergence; RDW20DS, total above ground dry matter content at 15 days of re-emergence affected by 20 days of submergence.