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  53 PERFORMANCE OF PARENTS FOR TRUE POTATO SEED ATTRIBUTES AT DEESA (GUJARAT)K.O. Vaghela 1 , N.H. Patel, R.N. Patel and C.K. Patel 2 1 Ph. D. student, N. M. College of Agriculture, Navsari Agricultural University, Navsari-396 450, Gujarat, India 2 Potato Research Station, SDAU, Deesa-355 535, Gujarat, India ABSTRACT: Sixty eight crosses were made in line x tester design utilizing 17 female and 4 male parentsof wide genetic base to ascertain the performance of parents for TPS attributes. Among these cross MS/91-1326 x EX/A-680-16 for berry set, MF-I x TPS-13 for seeds per berry and OP-1 x EX/A-680-16 for 100-seedweight were found promising. Parental lines Kufri Sutlej, JX-118, DP-9904, JTH/C-107 and MF-I were goodfemales and all four testers were good males for TPS production. In potato breeding, flower production and berry setting are two basic requisites for making desired crosses.The use of TPS as a means of propagation has enhanced the importance of attributes like pollen fertility, seed perberry and 100-seed weight (Gaur and Pandey, 1990). Genetic constitution of male and female parental linesdetermines the TPS quality and quantity (Upadhya et al  ., 1984). The present investigation was undertaken to studythe performance of potato parental lines for duration of flowering, pollen fertility, berry setting, number of seeds perberry and 100-seed weight, and to identify the promising crosses with desirable attributes for TPS production.The study was carried out at Potato Research Station, Sardarkrushinagar Dantiwada Agricultural University(SDAU), Deesa (24 o -5’N latitude and 72 o  E longitude, 189m amsl) during rabi   season of 2002-03. Potato does notflowers at Deesa because of short days prevailing during the crop season, thus flowering was induced byprolonging photoperiod by 4 to 6 hours with 200 lux from sodium vapour lamps. Crosses were made in line x testerdesign utilizing 17 females and four males of wide genetic base. Minimum of 10 bunches (40-50 flower buds) werepollinated per cross. Data were recorded on progenies for duration of flowering (days), viable pollen grains (%),berry setting (%), number of seeds per berry and 100-seed weight (mg). Performance of male and female parentswas calculated by taking average of each parent’s performance over crosses with four male and 17 female parents,respectively.The duration of flowering ranged from 41.33 days (OP-1 and JX-371) to 62.67 days (MF-1) in female parents,whereas all four male parents had around 63 days flowering duration. MF-1, Kufri Sutlej, TPS-13, EX/A-680-16,JEX/A-717 and JEX/A-592 had a longer flowering duration. All female parents had around 50% viable pollen grains.Among the pollen parents, maximum percent of viable pollen grains were in JEX/A-717 (91.22%) followed by EX/ A-680-16 (89.73%), TPS-13 (75.04) and JEX/A-592 (67.93%) ( Table 1 ).The extent of berry setting ranged from 22.08% (OP-1 x TPS-13) to 95.03% (MS/91-1326 x EX/A-680-16).Maximum berry setting among females was in Kufri Sutlej (90.14%) followed by MS/91-1326 (88.75%), MS/89-60(83.66%), MS/92-3128 (83.46%) and JX-118 (79.03%), while among males it was maximum in JEX/A-572 (72.62%)followed by EX/A-680-16 (71.68%) and TPS-13 (69.45%) ( Table 1 ).A large variation has been found for number of seeds per berry (Pandey and Gupta, 1995). In the presentstudy number of seeds per berry ranged from 15.53 (OP-1 x EX/A-680-16) to 294.35 (MF-I x TPS-13). Amongfemale parents maximum seeds per berry were in MF-I (253.30) followed by JX-371 (245.52), JX-118 (242.30) andDSP-7 (236.62) ( Table 1 ). Among the pollen parents, maximum seeds per berry were in JEX/A-717 (213.70)followed by EX/A-680-16 (181.17), TPS-13 (177.31) and JEX/A-592 (173.67).The 100-seed weight in various crosses ranged from 23.31mg (Kufri Pushkar x TPS-13) to 128.78mg (OP-1x EX/A 680-16). Among the females OP-1 (98.41mg) produced maximum 100-seed weight followed by Kufri Sutlej(78.86mg), DSP-19 (77.64mg), JTH/C-107 (72.29 mg) and MF-I (69.84mg).Crosses MS/91-1326 x EX/A-680-16, MF-1 x TPS-13 and OP-1 x EX/A-680-16 were promising for berrysetting, seeds per berry and 100-seed weight, respectively.Potato J. 34 (1-2) : 53-54, 2007  54 Table 1. Performance of parental lines for characters important to TPS production ParentDuration ofViable pollenBerrySeeds100-seedfloweringgrainssettingper berryweight(days)(%)(%)(No.)(mg) Female MF-162.6753.7768.22253.3069.84JTH/C-10758.0045.4770.81156.6272.29Kufri Sutlej62.3348.3390.14216.3478.86JX-11843.0054.4979.03242.3060.9985-P-12741.6759.2948.10211.8449.14MS/92-314645.3344.5363.02151.0961.21JX-37141.3366.6071.79245.5243.36JW-160 (Kufri Pushkar)46.6751.7877.93200.7636.86MS/91-132645.0055.0788.75151.5149.74MS/87-119251.3358.7668.84120.1150.72MS/89-6047.0046.8083.66201.5940.93MS/92-312843.6764.8783.46218.9139.38DSP-747.3355.3060.72236.6260.00S-5654.3345.7859.42144.8553.91DP-990441.6748.2778.73227.6665.58OP-141.3346.1135.39102.4598.41DSP-1944.3357.9556.3988.4077.64 Male TPS-1362.6775.0469.45177.3157.00EX/A-680-1662.3389.7371.68181.1754.66JEX/A-71764.0091.2264.93213.7065.93JEX/A-59263.3367.9372.62173.6759.78 Kufri Sutlej, JX-118, DP-9904, JTH/C-107 and MF-1 were found good females and all four males TPS-13, EX/ A-680-16, JEX/A-717 and JEX/A-592 good males for various characters important to TPS production. Literature cited: Gaur, P.C. and S.K. Pandey. 1990. Adoptation of TPS technology in India. In: Commercial Adoptation of True Potato Seed Technology-Prospects and Problems   (P.C. Gaur, Ed.), pp. 7-10. Central Potato Research Institute, Shimla, India.Pandey, S.K. and P.K. Gupta. 1995. Comparison of Andigena and Tuberosum for enhancing TPS production. J. Indian Potato Assoc  . 22 : 122-28.Upadhya, M.D., K.C. Thakur, A. Juneja and M.S. Kadian. 1984. True potato seed production: Flowering, Quality andEconomics. In: Innovative Methods for Propagating Potatoes  . International Potato Centre, Lima, Peru.pp. 117-47.
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